Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c5a95dfbb0b3d2…

MALICIOUS

PDF

139.9 KB Created: 2021-06-23 06:34:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381d3479b5c5c8ec9967fd53173a60c6 SHA-1: 373d86c42afb512cf59ba3c0ec6d1f584fd48fda SHA-256: 82c5a95dfbb0b3d2a0aa6a0932cca9992369a886ecb4416f65163b0c9c9ec531
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload storage, likely to redirect users to phishing or malware download sites. The document body is largely unreadable, but the presence of multiple external URIs and link farm heuristics strongly suggests a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://acryl-bg.com/userfiles/file/55164328445.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/c5d62dba14dbb77e090da54150db3dee/15952419334.pdf
    • http://aldo-ins.com/userfiles/file/liwaxajaborofibatejaja.pdf
    • http://perchegouet.com/ckfinder/userfiles/files/pujulijoxizibifakepodi.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/c5014c6778b4501672bcb5990d6ef85e/wiwumijanoxiwitonebepoke.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/8338c6cf2d4c326079f46c2026204bcd/gikerusiwavebudawev.pdf
    • http://bhk-aindling.de/userfiles/files/kizaxanoroba.pdf
    • http://billsky.ee/files/file/kipilipabafepujusev.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/ubsrd03l16paomgpij9i6h11e9/36479966787.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/vanori.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/ac85e8ec3551952684cd7eccc24fbd21/48184199090.pdf
    • http://ahkkpcm.org/userfiles/jirozovoxenipikilenagis.pdf
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/a571093119e6adfcaf2babcb3b723572/pomuk.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/9a50e0936dd11276bd3fc5acc14423ad/vuvosimiged.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/k1uiv15s3gni5ckeuu2glib7e9/wanejawanukazenidepanumam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=thema+sprechen+b2+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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b958.bin
34653af94d58a56fdba0e884c997ff8fff648a6c66438209d82367b5701ace92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B958 5136 bytes
font_01_sfnt_off0001ca8e.bin
252a50fab3a2db41b6ad62c8167dd7b7e7ae3fad7f7dacbe37e631a947f50f35		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA8E 12784 bytes
font_02_sfnt_off0001f3e5.bin
c084300e8c377cb779619e3a91398325ed2847e1bbd62da570449267dcf4a3f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F3E5 18820 bytes
font_03_sfnt_off000211f5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x211F5 4324 bytes

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