Malicious PDF — malware analysis report

Static analysis result for SHA-256 227c44d7083b9437…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 21:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c989648d1d68c081e165f2bcd2138ced SHA-1: 296384dcb3c91386546bcc8bc34a8c35828d46b2 SHA-256: 227c44d7083b94378a0e8d5116290660da61b632b4638c37619ddc5de712833c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns are consistent with a spearphishing attachment used to lure victims to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=how+to+unhide+files+in+android PDF link annotation
    • http://ambvetfanini.eu/userfiles/files/sobidawazerawi.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/bopevo.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/94935129080.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/81016164477.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/24364922455.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/neviwevisagugilijiditumi.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b651f5e1bc---44155314699.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/bepololoro.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/vovewadakitizureginoba.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be844e94e9---93045460957.pdfIn PDF document text
    • http://shippingengineering.com/files/ckeditorothers/sopivugonobuwinebewetube.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/1540694040.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161361e38d78fe---2991127339.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/74430350087.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/lajuwazuzag.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/33603106078.pdfIn PDF document text
    • https://kueapem.com/contents/files/vixojisomot.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/kujapunadazanunikex.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/78337475774.pdfIn PDF document text
    • http://feuerwehr-mittenwalde.de/mediathek/files/tuvodavulurugozu.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/93641995387.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tukolasotovoxatar.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/fuvanunujizotome.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210905094706314281bdkxrbbnt8uz.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/99910715737.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e104.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE104 10628 bytes
SHA-256: 9f1880245c32fedf1a5e313d13d64d9b187457bc1a81c9694fdb91980830b5be
font_01_sfnt_off0000f947.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF947 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11159 19172 bytes
SHA-256: aa730352c90342515d8d26217d6f55a63fcafdabecf91fb779faba2738d5d554

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