Malicious PDF — malware analysis report

Static analysis result for SHA-256 a538179c313b04fb…

MALICIOUS

PDF

87.4 KB Created: 2021-06-29 11:38:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 45924ab2fa73a749a054cb54c1e53531 SHA-1: 00b3dcd656d823c5e5aa02263c27c5e9f3228a08 SHA-256: a538179c313b04fb008942340bd478fbf4199ab39a9936d72344183274513814
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, suggesting it is designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The file's structure as a link farm on disposable hosting further supports its role in a broader attack chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c74e52a02b---34030914247.pdf In PDF document text
    • http://glotecgh.com/upload/editor/file/13396543763.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609104a815ca1---82435249903.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/38571860316.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/13421500202.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/1187fe7dac35f2f8641b042f691d4dd3/nugujixejadagor.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6afe5be5be---63098287914.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b635de1ad---kimanuvedegiruri.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/c59623412947b1fd5697814df14787ac/59379739144.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c44e1eb55b6---21304085919.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/daf1a7b9f6e40c59081fdce0a1f60c46/94556985573.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d841a932e9d95aa2d81e85b1b0546835/pugogobinuzulaferudolatu.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/nemefiwijimolabuwuv.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089ad1bbe2f5---bufikokigesijapivus.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/82366374865.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/tasuva.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/20650784915.pdfIn PDF document text
    • https://bonafideonline.com.ar/wp-content/plugins/super-forms/uploads/php/files/deb366967d399890c9ec0c1c3adec6af/numenoropujowavijimuzaj.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/vejijigu.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070e0f31388f---5936909638.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8df071ec9e---xoxikep.pdfIn PDF document text
    • https://rumahbaruku.com/contents//files/47845859225.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c85a053a0e---putulabemurutoxa.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab1bc14634---88052159429.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=what+planets+are+visible+from+earth+right+nowPDF 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_off0000f0cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0CF 11092 bytes
SHA-256: 887ac1a0c1c87cd815242e18714faaecfe7006901995744320a04fb79f8d6859
font_01_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 17620 bytes
SHA-256: 554fcdc3f4ce69ad7bf269c3f58efda9b23438dcdcf29ecbda55970f2932d6c7
font_02_sfnt_off000137d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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