Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6d502228f577d9…

MALICIOUS

PDF

87.4 KB Created: 2021-07-13 19:36:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b9e2640f5e84c852d931df96d35e88a SHA-1: bd86c78c515c62f629630cd69a0125985ba10436 SHA-256: ab6d502228f577d91761d8c034438c4246541cb7399d2dd930175a18ee01ebba
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade initial security scans. Numerous URLs are present, many pointing to compromised CMS uploads, suggesting a distribution network for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://crewmak.ru/uplcv?utm_term=zip+app+for+android
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/138c9829acbfa511cfdebfe94e8d1a88/lunazisekik.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084049e68bf7---nakiponadavorizufupe.pdf
    • http://18554080.com/userfiles/file/43518186149.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/5oeq3l3v0ogg0i9k14uhp5ia2t/garij.pdf
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16075a15612de0---24561752355.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/bplm3ggc1mracsdisqbg9jigld/tapojubivisurate.pdf
    • http://d4svancouver.com/clients/c/c8/c8601140a4283eb9b700f388a83987a3/File/dojubebujurenumemosip.pdf
    • https://groupunsur1.com/contents//files/31716126203.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/6ae5d4fd9d9262bf0eeef0cc38c46df8/didurafupozagurategov.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09346bbb7f---jorolevamus.pdf
    • http://agataklimowska.pl/userfiles/file/45313548430.pdf
    • http://ekotop.eu/userfiles/file/wojakifikivotevimalug.pdf
    • http://bortran.com/upload/image/file/20210627032654.pdf
    • http://soldearenales.com/galeria/files/wovewu.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1609423fb8782c---26150814890.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf6556a54---ralobifolaputorivo.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ilqf8rcbver7hcbi97igjqa9gq/ranexubifi.pdf
    • https://gerastar.com/userfiles/file/pobili.pdf
    • http://mobydick-band.de/fckdata/file/34292685841.pdf
    • http://classicalgardenornaments.com/uplds/file/26989406293.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/c1115764ec09c92369b07620a96706b0/73510120050.pdf
    • http://tatishev.ru/admin/ckfinder/userfiles/files/zitonetakekibesato.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f629.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 16792 bytes
font_01_sfnt_off00010e40.bin
0be818ca5adbb6444f09e385f4229b1eb8a4cc524968f111eece1d42783c3a36
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E40 10008 bytes
font_02_sfnt_off0001247b.bin
bd4a24e533bf7e2f9e74cd22bf6ddeddadb6c021cf34edd67d0dfcf27e8ebc74
pdf-font-stream PDF embedded font (sfnt) at offset 0x1247B 17128 bytes