Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc108bc9093d5ce9…

MALICIOUS

PDF

89.9 KB Created: 2021-07-01 23:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b36a61b445e052a0d52ebd7542bb2c01 SHA-1: f78731435938b15be5a9f1e820c77a2439218c20 SHA-256: fc108bc9093d5ce9918e5698f2bec78018b65a51dc7715bb407e48a8ffc933b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 https://laborke.ru/uplcv?utm_term=pulling+my+leg+expression PDF link annotation
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f98db3c2cd---sularakobupudezuxemevipok.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/d25de4830190f9d4d2f7096aef0e1201/sopoxobejurexadi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/15187273373.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70ea094552---duvegazine.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/80635986653.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/wedajevib.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87956d2146---mujekofo.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/gobowuziwivusole.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/q86iqlgk73ea6ivn6t7kjgjr54/nifuxuzarubejawuso.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160da43185084b---buwewasuposakolifof.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/0069153eb324f3ef1d77c952663764f2/wutojanokanege.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef8221f3ab---12118679090.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/dibubolebexomuxute.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088ec0fe1b47---tigezamimuxexit.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a370552c127---lekenemori.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160792a374508d---mawif.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/7098120682.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/da35296179f33cdf6af77666b2a72584/tavabufakanenubi.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/n7im57vatkcpai0la9g2tdpim0/46449707751.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/iqa1fcouh529c9dn3mv7gl6fd1/41865489554.pdfIn PDF document text
    • https://finatwork.com/userfiles/file/65771764128.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/56774703483.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/52109008671.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab56f4f1fde---tojizamusufofigu.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/fv5crq124cluk1laf93480qg71/99179034192.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 20280 bytes
SHA-256: 327e858eaf14420fc04d163cdbb03f1fea00e9f1876ad19258c2e87916276885
font_01_sfnt_off0001126c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126C 10652 bytes
SHA-256: aa6610cd33fc6c44ca4549ba349f25b0f86e60f038cb5752486040d61911c172
font_02_sfnt_off00012ab8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB8 6048 bytes
SHA-256: 1380d8d41a0f4ec0a6ebabae9c34a65e5fe79a16fb5dec83ed6f516f15c34fc1
font_03_sfnt_off00014038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14038 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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