Malicious PDF — malware analysis report

Static analysis result for SHA-256 db81f9288de7284f…

MALICIOUS

PDF

86.3 KB Created: 2021-09-05 01:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8cd85857d62f6cf3a0508a2058d6a75f SHA-1: 11905f019c19d4c524cf566d5947a1ca1119ab1c SHA-256: db81f9288de7284fe23c867de6342ee979d6fb4dcdeb237aee57e9a1468d38a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised CMS uploads, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is heavily obfuscated and unreadable, providing no direct clues to the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 http://fittbike.hu/files/file/59418787494.pdf In PDF document text
    • http://techscreening.com/userfiles/files/wijekirexe.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/63940286867.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/62413182851.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/c096a90d16c14e308f42b8396a0be632/fajij.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/zuranojudilinen.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/norulapoxarelup.pdfIn PDF document text
    • https://easypayindia.in/userfiles/file/92438707791.pdfIn PDF document text
    • http://hndgyl.com/v15/Upload/file/2021621926321034.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4n81sndac03vj81387duh4t1b6/26892597458.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/24650992287.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3b34a86380---tunesobupobim.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/waxezuz.pdfIn PDF document text
    • http://119pump.net/d/files/90829534224.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/1cc81d52ffabb638035c34277e484ae2/36731657531.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/7441256347.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/14486009021.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/6678091fb3957b6ca3978a15e10e6341/buvobugaxawodamo.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/lifuxemo.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/81589730755.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/rv543ir1imv3o98j7jdlbs00t6/43333101500.pdfIn PDF document text
    • http://skipjackpoke.com/ckfinder/userfiles/files/40439378413.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb2cb4c251e---fenimepixuvexeji.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608173192adcb---38122112233.pdfIn PDF document text
    • http://ekonopuntos.com/campannas/file/5696269567.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b54fd57f9d---zafefeditutumuvana.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/15981429923e3d1ce1522feb0b81fbec/kexoxid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=real+food+fermentation+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ecad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAD 18264 bytes
SHA-256: 8b4bff0b0d66d2f610b26bca5f15e2608ad6517d7e0274b5d9af4c48d76ea893
font_01_sfnt_off00011b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001339b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 10536 bytes
SHA-256: 91f8d8226d3f168e0530234f77bbf4f3dca13ae1001a1da33de52b2c3e58a46a

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