Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c018fb1f179d50…

MALICIOUS

PDF

87.4 KB Created: 2021-09-03 09:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0bdc7d6c72b386367e292722f2b581ae SHA-1: d2bb39f1ea89c2dd7d5a3a7840291bd96adda234 SHA-256: a4c018fb1f179d5042d519b5a143a0f1637ac3506c5d58332c8b9353308a4948
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://polyalpan.hu/_user/file/69639886158.pdf In PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9cf043407e183844866cd6adb0d1a744/bebevufilowagazokife.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/dojefuguxawik.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/67425691536.pdfIn PDF document text
    • http://synfarm.com/upload/files/17202813816.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/66398625421.pdfIn PDF document text
    • http://twilaw.com/files/files/29612870599.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131682ba61d9---69158316795.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/bewobariwamojosimejifamu.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/vimozuwipudarelo.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/33371572541.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/bc7c8e81d0e88e3d52bbaacdc9bd32c1/rijesab.pdfIn PDF document text
    • http://donkaew-furniture.com/ckfinder/userfiles/files/41061763214.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e371baee4d9---69978779823.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5f0da793a8cb7798e52c69ae0b43eb61/50343030513.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ja3l47j2j4dig803bkd94j8pu1/51871123981.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/97417779525.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/88261136549.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/8049d20e3b671882e969e9030d7fc671/raketisobuzowavisipof.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021081418501283.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/3845572219.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210719_0C722455E429A154.pdfIn PDF document text
    • http://mxagproducts.com/upload/browse/file/mugoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=english+composition+writing+examples+pdfPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF199 17144 bytes
SHA-256: 2a7f7c927a08e3371a9c5e4eeb6fe82b73affa77deb38adbbc5290143ccf9755
font_01_sfnt_off00011e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E01 11236 bytes
SHA-256: 6c6d3c787fa6050471f63f60499d9f8daa66002655ca7762ae70a15ae167688a
font_02_sfnt_off00013805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13805 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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