Malicious PDF — malware analysis report

Static analysis result for SHA-256 5551058cfb33c3e9…

MALICIOUS

PDF

97.8 KB Created: 2021-06-28 11:21:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6f91338f87ca74dfdc747740d9a0d3dc SHA-1: 4583b3bc21da7ad3e785b60f2fab71f24873e3e7 SHA-256: 5551058cfb33c3e9271dba3d3a63b692201366130d4c4d2e6ac9bed08234c4f5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The presence of multiple external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://chcial.ru/uplcv?utm_term=idioms+a+to+z PDF link annotation
    • http://aksaaydinlatma.com/img/editor/image/file/90806658480.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/3nea2c6utk5tel3fgk0jaqp8kv/55744014123.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/sgkl89suuh811fu9kjn1kke7gi/18511244237.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/wifeluwokiluzagezu.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876b0b6623f---supukibebizosubolekube.pdfIn PDF document text
    • https://wipaphun.com/UserFiles/File/modidez.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/57a5d9b79a95bf6c149b844714f234d3/tubaremalukog.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd9t78pl2teli3rrbvhskruf3s/79624279419.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d9bb73f05851de12d1c744c7dd94bc47/biwolabunef.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a019f4ec4e641c296c541f09e7dc2740/65112885993.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/n0ac50c5akp07om1kg7a9tdtc3/bikopatewobavikejesix.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2cef22de---fozifawevapunuzepuko.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/7889658156.pdfIn PDF document text
    • https://nasikampung.info/contents//files/10852519432.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/iu8jnbr0bksk9usl7br0uif01g/detexokeg.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/mizonekumanawexofado.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/66613736365.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a15557664ea---rutarifotokijowimek.pdfIn PDF document text
    • http://filtrydokoparek.pl/img/all/merozumo.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/05e633fc2ba0c23f8ebe4e905dd77fa0/puderukiraxunurelufok.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5dda58c0c---93251781192.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/85626269015.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666987eec7---974878589.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949f8253bf1---47195597948.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/fhp1jj6arqr5bn4l3vlajam2t6/sefagawapap.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d735191fc4c---seludisazowipagijoxevog.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_off00011db6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB6 17500 bytes
SHA-256: fa4a6dc838872f7923b5aa53287da55cd02f045831243513599a31bceca8d1c7
font_01_sfnt_off00014b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001639c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1639C 10036 bytes
SHA-256: ef5ad44d5862be370ee5a81cb409e93433b5cecd85305074d6d6ef9599a2ffa5

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