Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a059a1328713cbf…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 20:14:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 487f50ba612e9446e1c0c12ebd988e4b SHA-1: 5c0bb3ba85ab3ab87131ab32aedae11c95cbe9cd SHA-256: 2a059a1328713cbfc8ba008ef37e72abdc7920e51111f0dcb316f1eb54529be5
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URI heuristics suggest it's designed to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://samoinstitute.mn/uploads/assets/file/9576453059.pdf In PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/fa35453b99823cd9097b020fe932a2d9/53431279790.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16085cae37f261---71324513552.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e3d96e5fdf1---76215362823.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16095365d13d87---481657022.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2641352a7---famufolizetixuxi.pdfPDF link annotation
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/985765ec0c2e2403a1ff6f77ed1415c5/xigiwedemidanapuwig.pdfIn PDF document text
    • http://skncn.com/u/files/rijijofawojesi.pdfIn PDF document text
    • https://petkasem2hospital.com/images/upload/userfiles/files/joxon.pdfIn PDF document text
    • http://iqlacpro.vn/emotive/upload/files/76229093420.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/75718313338.pdfIn PDF document text
    • http://dioblina.eu/userfiles/file/67734343911.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/gokejilalojewig.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/29849958372.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/d8e08248b8d0921c242ee33e01820c14/52469366063.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/qbaisn4voehq8jrbft3vr26k9i/88796401615.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/9f2a9870c54525f95979b1ddf8bab463/xigok.pdfIn PDF document text
    • https://lomasdelaweb.com/userfiles/2008.09/file/barolameriza.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077d99e9381e---81927872283.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774cd9b1a40---velazizekasaluri.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608519859c761---81086980491.pdfIn PDF document text
    • http://laduses.nl/image/file/wukujogemosugoji.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/55938092221.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b684a7b6bde---rekigonesukixagexubitil.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/v015savkebkdn0o4uf6jba428k/33006779262.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+sinhala+story+books+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bce3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d4fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FA 10896 bytes
SHA-256: 4e9073aa308206417ef20d505a115315d3b17f10ee67ab8b389ae33bfe7ada79
font_02_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 19672 bytes
SHA-256: f356fbf576bfce521af87454795fd391edf1b3bbfb75f8edc7f8e9e42d7b513e
font_03_sfnt_off00011fed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FED 2040 bytes
SHA-256: e908ca4144daf0f053a247307f96115cab70598e32b212277c22333d6c9d5467
font_04_sfnt_off00012940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12940 16476 bytes
SHA-256: b35ddc3917f72e323dcc03a8ec2b6e303c2224758bd1a0f0a7f3d00b578b0510

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