Malicious PDF — malware analysis report

Static analysis result for SHA-256 8270a9a24ebd2312…

MALICIOUS

PDF

75.0 KB Created: 2021-08-10 14:28:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b007d502ae2b91064f8fccea3d4f1e83 SHA-1: 33654867983c4c8275327c00e2ee08940f0309c3 SHA-256: 8270a9a24ebd2312e82fac564e349a7ee3c0cb29803dc538bb42b946ab60a5f2
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to potentially compromised WordPress sites, suggesting an attempt to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/96626bbbe33f18c50212bf3281e19ed8/92378455084.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160e3726b53deb---97338531556.pdf
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa1e9ad17f---fepiw.pdf
    • https://tekartltd.com/upload/files/mexorije.pdf
    • https://heatingboiler.ca/fck_upload/file/77547510433.pdf
    • https://www.proctoloji.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c5b09798e---netizejapezev.pdf
    • http://travellerisland.com/files/16088090612.pdf
    • http://alnoorcity.com/userfiles/file/22698211424.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/pgoc0dttivsg50c3n38fvqj2ea/3415787209.pdf
    • http://dorp.pl/userfiles/files/kitupomelum.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a47d1fec18720fbed49f2aaac9fe80c2/98172872470.pdf
    • https://associazionebriciole.it/public/file/8241387378.pdf
    • https://childrencareandliteracysociety.org/userfiles/files/misugefigokuvovojofam.pdf
    • http://miyisz.com/mingyi/images/userfiles/file/xuwexefogewodo.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/fdc8b477babbd6e11e1a8d5799d72c31/61169227085.pdf
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/7d23f85ba6653aaa4046068c210deff8/wejizamufinipuvo.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f33cd483ac---58147993365.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/3c6ab7c5d0daf4fe1f885d4d5147fa56/59966810308.pdf
    • https://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/fag0jm69mdeasro2cs37gm7vj1/kutaretinixonuvuxoruzow.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41fbc9b64---robexizagubewajiwojufeje.pdf
    • http://stalmost.pl/userfiles/file/35963797553.pdf
    • http://drkoopman.nl/cmsimages/file/8887282861.pdf
    • http://lnshiyue.com/userfiles/file/20210530055625_1515540049.pdf
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078af7e336cf---19054647438.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+change+assertive+sentence+into+interrogative+sentence
    • 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_off0000c525.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC525 16792 bytes
font_01_sfnt_off0000dd3c.bin
955ca37fbf25647197e29f153f81c75acd291e3cd038c17ecb0bbb7ff08151ba
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 10608 bytes
font_02_sfnt_off0000f57b.bin
8d946d60bada48f7d0a2d898a84c381151dfe5065f58a4083bcc130afcc2ccb4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 15524 bytes