Malicious PDF — malware analysis report

Static analysis result for SHA-256 856dec96055c80b2…

MALICIOUS

PDF

87.0 KB Created: 2021-06-26 02:53:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40099419ac0b08a9af93d05b803fb922 SHA-1: 07370f5f3dc31496931f75f134f89806a8d2868b SHA-256: 856dec96055c80b230e86e801c47fcaea5531fb8469c8aa2962c82952ceeb687
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of a link farm used for phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cb350ea52f2---fafobodumavoganopusatites.pdf
    • http://euro520.net/userfiles/file/1622924251867760516.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/0e28k2enlk6ps7qpi7hgj2mit5/42486418291.pdf
    • http://hungbuloon.com/media/ftp/file/28081293733.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/5925a36fd412ee7bffa81e573d70a605/10120855284.pdf
    • http://infinivideo.hu/sites/infinivideo/files/fuwinarelim.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606df99d84247---vowipegufewutabu.pdf
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed71cf024e---sofedal.pdf
    • https://tecnibat.net/uploads/archivos/zaposepigu.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160847b24a36fa---41217788189.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160bfd1f56cb5c---delodapivabugitoduvekofaj.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/7139513c4b2faa10017d792b46a44e1e/85273038110.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de70be754c---37284872046.pdf
    • http://garderoba.sk/images/_file/vebosa.pdf
    • http://banglatalkies.com/dynamic-images/cms/file/dekedepidejimujixu.pdf
    • http://beiwendq.com/userfiles/file/28751280698.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/a75c563eb9e44d20c5719def4857e9ce/kuvurevemuko.pdf
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/1mlt4a7hpp890k0jo80495ou1q/9101647499.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/fbd0524f6d4b0c05e243d8f1c39e0543/78104694284.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0effaaadc---21887010687.pdf
    • http://vanillasky-ch.com/images/files/mafagulojivumujedekidenid.pdf
    • http://diysmart.net/userfiles/file/ziwijozopulifak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=be+a+good+father+and+husband
    • 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_off0000f275.bin
48b717cbdf3883781db28f3275bfb17403db7c344729d6d9495de567dba478aa
pdf-font-stream PDF embedded font (sfnt) at offset 0xF275 10788 bytes
font_01_sfnt_off00010b0b.bin
06e2e751b59d8de17cc2fcda03208cad419d281dfd12b14481d422b5b24546ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0B 17124 bytes
font_02_sfnt_off000136f2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136F2 16792 bytes