Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ac1815a7f8bed52…

MALICIOUS

PDF

86.6 KB Created: 2021-06-30 12:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: db3e4109046dbe7d95fb230078d9f8cc SHA-1: 1b321410b69dca7838825bcd1b320132ba2d304f SHA-256: 9ac1815a7f8bed52d6ad6563a9c6274eac972b7f04461ab972c71abb6507956a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/n7ic02e0b0101ed8di75g2ufvu/galavazixix.pdf
    • http://littlepearlspublishing.in/data/eimages/file/gezabufinabe.pdf
    • http://akinmedikal.com/uploads/file/10181638162.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b467bca5a3b---74468408773.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072c0afbb09f---kamabologawakimejez.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/dqeag9s0k6udf7cdda6cm7u78k/60641186461.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8bec0e6ae---60262591365.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608574ff4680d---nezubu.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/h9mv3dle82jh3s27ig1luifi5n/vopasugufokukimi.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f19d82dd6---74243580132.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160929e9c2e38a---46682403710.pdf
    • http://csc0535.com/userfiles/file/20210617125953_9bhmt8.pdf
    • https://kermanrooz.com/img/files/86732441311.pdf
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/379b57d7184f4c64454278e676c79b7c/36316772201.pdf
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/7ef45e32801fca6e784100ef80e9ce99/85188101157.pdf
    • https://tolgyesvolgy.hu/userfiles/file/94613626351.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160732dab66556---71787761386.pdf
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608983d9bbf17---jirosofugikakemej.pdf
    • http://allasclub.com/campannas/file/87282825208.pdf
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/0aeieu49evdmb7su3ehptu4jf4/tokilatumabuxapoxug.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cffaf7aa27---68332195348.pdf
    • https://greenfuturevietnam.com/Upload/files/92726895855.pdf
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160713d357b220---25681248831.pdf
    • http://altelaw.com/uploads/image/file/77414936692.pdf
    • http://soupworld.de/upload/file/bibojukeduxofogo.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=ac+joint+ligament+sprain
    • 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_off0000f095.bin
b5d88e0fd2e95d1b6de89ca878464687d2c5c95c23cbd5f552654abcad9a6f9c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF095 10828 bytes
font_01_sfnt_off00010989.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10989 16792 bytes
font_02_sfnt_off0001219b.bin
45a3ee1f625ead2619352908b370a00c9aabb7bbae9763fa69eea8612fbc607e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1219B 16960 bytes