Malicious PDF — malware analysis report

Static analysis result for SHA-256 a97e4c14aefd3b1c…

MALICIOUS

PDF

72.2 KB Created: 2021-06-29 20:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df9439fee163780c1262767d2b69ef63 SHA-1: 356cf96da950374605fbbed4d8bae23d88166dbc SHA-256: a97e4c14aefd3b1c5a84c68fabf58cfec7815bc87dadec0a2522de405e1cfa4e
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous external URIs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://agnieszkapawlik.com/userfiles/file/wubak.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/5461b7516aeb3ab0197df05a9a31fa69/jibozujepogateza.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d65535cfdcd37d14fc7b0eccd875405d/68356458212.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/kr272g6298a9dj6ir6retp1m0q/kitilegakesaxove.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c31a0ac5cc---pilanif.pdf
    • http://tipiland.net/upload/file/jefexatozoridotagofisoxo.pdf
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/a2232bd69b9db1bc8e1fdc594c699583/rogapimuduxopule.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc13b836be---29838092912.pdf
    • https://www.deuba.info/wp-content/plugins/super-forms/uploads/php/files/r3cgb80andlm2hv4jnm51afm99/madaladuk.pdf
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16070a8e9603c4---53994298085.pdf
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/90639921292.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a1a9367fd---53563019604.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/cf4d84d382125d77848813aad6b38515/meninusebilig.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b736fbea346---70047612324.pdf
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b624077c54---21766171492.pdf
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/miuo04alil6ecb1ut755sio2a5/75155362023.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8d14790991f3d2af0d894238b45e4ce5/wopakakojotilijofupasu.pdf
    • https://alnahamgroup.com/userfiles/file/norurit.pdf
    • http://cerezolorente.com/files/cerezolorente/_repo/file/55845048132.pdf
    • https://alshamiltrading.com/alshamilfiles/file/riritelurokaruraja.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=foundations+of+electromagnetic+theory+3rd+edition+pdf
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/23bfdc6f70d076ac1c3fe6d327fecb14/80839931029.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_off0000b786.bin
f1d0d7d969c1a3193364d0a7852094b85960b941463660a02ebab6f7f5396fe3
pdf-font-stream PDF embedded font (sfnt) at offset 0xB786 15908 bytes
font_01_sfnt_off0000e0a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 16792 bytes
font_02_sfnt_off0000f8ba.bin
cb3e4da2636bc0ff02c47bb37b23de54ab5d60c965c3b2fdbba8b5c4703e51a3
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 11432 bytes