Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ce21e14843a078…

MALICIOUS

PDF

88.6 KB Created: 2021-06-23 21:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46f1b70b5252cb2a68f55faca17c20d8 SHA-1: 861deaaa958e320967c215d85343f92105cc93d7 SHA-256: 12ce21e14843a078a6ceb319c2afd11812d1e88915d7c4c1dca170ed284ae38e
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an effort to obscure the ultimate destination or leverage compromised infrastructure. The embedded URLs and the heuristic firings strongly suggest the document's purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9703

Heuristics 5

  • 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
  • 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://alkalacarservice.com/public_html/userfiles/file/numokaxi.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15ea2d810d---29006819636.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/ed339a04d9234df75dc6719a8f580598/97080198319.pdf
    • http://afgventuregroup.com/cfiles/file/mukoxiv.pdf
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c47cbe3b653---30469007719.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081342f1b610---parirutexolakorizuvivudil.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/nk3jllrbnagupnv4r3dsrvm7s8/lefetemit.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728eab0bd6e---54054125202.pdf
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6fd39941e3---90989963533.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160727578a0432---xotupobexilujas.pdf
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/4f6cc57e97a17b177f28554c7dfd4100/wutim.pdf
    • http://allamericannursing.com/userfiles/file/31023802654.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7865b9e2524ec2de570be4a21a372630/86006822729.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=stardew+valley+missing+axe
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013157.bin
948154b319afadd3403554d860106e411d79eb38318fc402afebf7d8aea0a209		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13157 5568 bytes
font_01_sfnt_off0001444e.bin
9fc72adb4691cf92124360728ab6a5c3a3f017d8695c90dd873ef5a222eb1efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1444E 11160 bytes

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