Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a9c52d2bda752d9…

MALICIOUS

PDF

170.8 KB Created: 2021-07-14 04:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b24406a9df681e43f74c3034285551cb SHA-1: d4743df78604b3f2bb4861394134bd7308ebf723 SHA-256: 9a9c52d2bda752d9b9b68df6dfde522a4869c6a2b9c9c4535559b58cbc72dad0
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous links pointing to compromised or disposable domains, likely to lure users into phishing or malware downloads. No scripts were extracted, and the document body was unreadable, but the presence of many external links on potentially untrusted hosting strongly suggests a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/10177afb71b70f67aa4f67175bfee821/pagulajojumobuziza.pdf
    • http://aitrans.org/UploadFile/file/F1202106201528503349.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/9a7a5d09b70b2f84d5a94120126c4481/dukivadu.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/feee60a3db9c39dcd2dc269810cc1baf/paveborit.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/a413ebd9d2926ef3156a7ed997024c5e/5298725192.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/26680683341.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/166db711068a52733368f4ab3abd2591/17750591615.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608547eb095ac---61524029775.pdf
    • http://fontanarosaserigrafia.it/userfiles/file/suvitikizebinaxikafun.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/gqk40ljbe6me0j50dh7s3a5ft2/wotozukowelirukegovejus.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/dq25o8l4qsmhi4uj25f0n12ma2/nusatesulelug.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/90adbf9470c46317909052275db428df/zijimifobufusotukixusudi.pdf
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082fd6fd7a52---jesesonatovowotodo.pdf
    • http://arci-mp.fr/admin/File/38208461622.pdf
    • http://arci-mp.fr/admin/File/16140454564.pdf
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/o8j3fa4hsi7p6s85meh9o89ocr/93421344224.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/377ac22abf3ff4a385b94e9457f03065/94367637566.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/73295391830.pdf
    • https://aronabritcan.com/userfiles/file/90571631670.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0f80405e20ce08c01613cf1372ad846/99171523516.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec7a69d2e5---xanilezevapef.pdf
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b3de021a96e---98149039776.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ed+westwick+leighton+meester
    • 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_off00023f11.bin
c501ff7c3712b06d187918b3ae3696ef5d3fcf87b2c0c079ed49ba8285653137
pdf-font-stream PDF embedded font (sfnt) at offset 0x23F11 17340 bytes
font_01_sfnt_off00026c74.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x26C74 16792 bytes
font_02_sfnt_off0002848b.bin
6c757fdeb8f7f1b35cbe9fe82487d2767c58d5584337c2fa571736f5908148c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2848B 10816 bytes