Malicious PDF — malware analysis report

Static analysis result for SHA-256 0976742f15d528ce…

MALICIOUS

PDF

87.5 KB Created: 2021-06-26 09:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6304de76907415e416a108486641bb7 SHA-1: 3a5729f2881bd93e2cda7630e263ed0e1370ba47 SHA-256: 0976742f15d528ce4b26f7fd416a3f1869ce9bafd7a17464db63ef2f8acf2c42
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's purpose is to drive traffic to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7ebc5b07d9---lanisobaxekaselugobubuv.pdf
    • https://abofahed.com/userfiles/file/gozikaxa.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/v4hdp9a10ghhjdhf9e5gl9s3se/kadugemewisago.pdf
    • http://cestovni-postylka.eu/userfiles/file/45689073027.pdf
    • http://ersatzmonitor.de/userfiles/file/simogirotikovokukitin.pdf
    • http://akinmedikal.com/uploads/file/guloratemejezizasiwoxa.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d266547d2ed4ad7f50bdcd4130b65bb2/75951777498.pdf
    • http://csaladiegyteruautok.hu/userfiles/files/guzevufebereka.pdf
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6472194e89e53cbea4cc20830397a620/mubipu.pdf
    • http://metrocars.london/survey/userfiles/files/13160805976.pdf
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd5eb0b0e67---48161258547.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/0opupp0r80725f4t83drkuns6o/sasekukusabavikeso.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/31663f37ai76i5hro27quqrm06/63005045810.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/213dli1ho20o5lprvrp4952f3u/kudinib.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160758588f07de---27769814896.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/js1sq9nr0uj78pffe4ldkhmag7/17251805837.pdf
    • https://lienlacanien.com/img_pages/file/xedamizogubejowag.pdf
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/kutumusubiverukogomemul.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a528606e6---67915157477.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3dc38d581---vazelanovumojon.pdf
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/zoxedawawuxeperazuginomob.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=tamil+words+with+sinhala+meaning+pdf
    • 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_off0000eb78.bin
c7550eca613b32f1ff81a55ba6e85577b65ac86d83681defed1f88e159a6e8da
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB78 21016 bytes
font_01_sfnt_off00011f7b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16792 bytes
font_02_sfnt_off00013792.bin
16d4710fe9e990100417b3e793e0a640a5a135a38c60152ebf1d8257273bc50f
pdf-font-stream PDF embedded font (sfnt) at offset 0x13792 10992 bytes