Malicious PDF — malware analysis report

Static analysis result for SHA-256 29177033e5b5975d…

MALICIOUS

PDF

90.5 KB Created: 2021-07-04 02:31:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a604fa6aa4928b675536aca6c6e9c25f SHA-1: 3606d4ce8d316c9df749761b973bfcbac08b1824 SHA-256: 29177033e5b5975dc6c530de4c858f3f76d5ff6c2f715d0004c6f13ec162933c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or SEO manipulation scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of numerous external links is the primary indicator of its malicious function.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://astorandblack.net/emailer/userfiles/file/mofij.pdf In PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088d5e0d272c---wowajex.pdfIn PDF document text
    • https://bbgpiti.com/userfiles/files/6288307823.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5b9431e2f---99649119367.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c44fb213d2d---tukuloxar.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081cb28e3ce4---gunajusitapulenipavetin.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160725bdb0900b---7184517060.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/9338012443.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f3a849a94---lideva.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1206921d4---pefizasirozakemiler.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41a18c22d---41380416044.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089cc9d56b78---deneva.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/98745302029.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/82840e5c1f811b360522f08a770f631a/54815840370.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/c65b979270e01028b223096ba29dbfb7/pefawifekigimofakawa.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/94619110018.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/zopovexesebivuxekomatajek.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160986a64178b7---51809844134.pdfIn PDF document text
    • http://lyshiying.com/d/files/gezedumez.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6277ab27d---5694304918.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/9389354177.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/wevotevusudebugiruzuvole.pdfIn PDF document text
    • http://falerisztika.hu/tmp/67085137295.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/wolafa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=breeding+pure+dragons+in+dragon+cityPDF 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_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 17424 bytes
SHA-256: 503ce2f171aff06223e60557a1d533dc9f77cb8d099fe42f74a84b81984ec74f
font_01_sfnt_off00012b75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B75 10908 bytes
SHA-256: 1c9790f89c3734ec5e0efdd736d89e9ba70a3ed87347e69e4adebf15364a7f8b
font_02_sfnt_off000144b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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