Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede4eecf5c9470ea…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 17:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ade18b8e34f6657633dcbca507b83da2 SHA-1: 5812a5cedb982ce92aee670d30575012f6be857b SHA-256: ede4eecf5c9470ea758ec59acafe57c51682b7e9492b41ffdfa1685f623a66b8
196 Risk Score

Malware Insights

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

The PDF contains numerous links to external sites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics reinforces the assessment of a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/0c5c7a293fa1a8abe0eab8c39be3f60e/zaxobanaxosanerifaralo.pdf In PDF document text
    • http://amandatravel.com/userfiles/file/68646195532.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16093a61573303---45900980964.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb70243dad9---sumedunusosuxokukulobire.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/48209267528.pdfIn PDF document text
    • http://kyanite.tv/userfiles/file/lutajomonovufamoke.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b620253287---mebegowelosapa.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/simuwobozi.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608296902ce4b---wesevigudokowomifikuroxi.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/fobazozomofuda.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/68156216934.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/630ae399b8eea971578d90a1d47d8b3d/tagugirobabisedum.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076bc6087b46---sotamifasib.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/buxobobax.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d1b318a380---75186165965.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/11751253728.pdfIn PDF document text
    • http://ippon.lv/uploads/File/keriworobigibogoro.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/978c6e00b5f9d60fe64eb80ca1c0adf3/27151061707.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/16634668507.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609346dcccfa1---jirorizizofit.pdfIn PDF document text
    • https://palcev.ru/userfiles/file/22468008723.pdfIn PDF document text
    • https://aicsmindia.org/ckfinder/userfiles/files/68021351535.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/95727043460.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/lkgcm4dj0jgptq99aj7vbbt09h/29697354207.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/vubirujijutubalugeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=reliable+question+bank+class+10+social+science+pdf+downloadPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC45F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC76 11296 bytes
SHA-256: c10f6d05d4b034961343f194868301ad237f7e86edd4bf354869a5299fcf412a
font_02_sfnt_off0000f6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6CD 17572 bytes
SHA-256: 6f07f857a165099a04263240cd3599245b9377a7516268db8076ede514191331

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