Malicious PDF — malware analysis report

Static analysis result for SHA-256 34f71eace655bc63…

MALICIOUS

PDF

78.7 KB Created: 2021-09-12 23:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 3f37da8b4ba442b212c4fce7416c779d SHA-1: 4a1639be6200b46b3618defda705b96aa787c7a1 SHA-256: 34f71eace655bc63f44710c4bfbdd5779a336ba72da85244acf4bbef2ee27b9b
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, characteristic of link farms used for SEO poisoning or phishing lures. The presence of external URIs and link farm heuristics strongly suggests the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://fixafilm.se/userfiles/file/96776636831.pdf In PDF document text
    • https://questyme.ca/userfiles/file/xunatuvuvutewodomebomati.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613311e012ebf---kigopixuwojezutan.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/6446858451.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/buwarewogonarikuwixiri.pdfIn PDF document text
    • http://vitrine-prof.com/files/movebilovulasewejebowoga.pdfIn PDF document text
    • https://gdwtechnology.com/fckeditor/file/In PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/jobibufepujokajorofal.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/53791412820.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f0338fdcd---venija.pdfIn PDF document text
    • https://ctyhoanongangiang.com/userfiles/file/53639815041.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/87736128874.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/7614356074.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109081253188915.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/161363a2a89fe8---gitumesumov.pdfIn PDF document text
    • http://onlinevay.com/upload/files/91577967591.pdfIn PDF document text
    • https://silverlabpupsforsale.com/userfiles/files/manegupulawoni.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/laganifisakubo.pdfIn PDF document text
    • https://afma.pt/site/upload/file/popozenojorida.pdfIn PDF document text
    • https://equinox-e.com/upload/UserFiles/file/wofoxafigu.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/feremefo.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/73556461331.pdfIn PDF document text
    • http://essiac.cz/UserFiles/file/23987888204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+xapk+filesPDF 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_off0000d033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD033 10660 bytes
SHA-256: 3bbd661a7aeb135056ee1805f1980f2ac19f6ca61bd045d1cc7ceb37e94aa36f
font_01_sfnt_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 17232 bytes
SHA-256: 54d1da235c722bf61528569b133a869835752d6bff1edceaa3de3dd05ec31023
font_02_sfnt_off000114ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1