Malicious PDF — malware analysis report

Static analysis result for SHA-256 9119a615efa6678d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 14:31:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c1b584f24ce9dfabfa45e551a9ac7283 SHA-1: 992eed529d4992c5a72c4e2873ec1c64e8d3fbf7 SHA-256: 9119a615efa6678d99fb75695da8275dc4b1d08b0f5828c1ffc01fe5da409a68
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a common pattern of using embedded links to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=what+is+the+use+of+charcoal+in+minecraft PDF link annotation
    • http://surausa.com/uploads/files/xerogawekozunakolomune.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/67814783866.pdfIn PDF document text
    • https://tessuno.com/upload/files/6136c1b675944.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/bigesusurajenobe.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/fexokazowusodadejo.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/jizonixebobabinadiwaf.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/59928081346.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/40729357346.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/zekesibirit.pdfIn PDF document text
    • https://angem.fr/userfiles/file/3610827444.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1ff1a98f6---15935380214.pdfIn PDF document text
    • https://www.abrasco.org.br/ckfinder/userfiles/files/94827553580.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/63232860633.pdfIn PDF document text
    • http://lucidarepavimentimarmogenovaealessandria.it/userfiles/files/89903716109.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/zanurikawu.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/tizomovoxosexebudewe.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/sunedexedugokit.pdfIn PDF document text
    • http://charontrade.hu/data/file/33923167567.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa9124cfe---67836284177.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/pofanodipa.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/78954210169.pdfIn PDF document text
    • https://33mobility.net/uploads/files/rilezibinu.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136551a0a8b3---supogajopekiri.pdfIn PDF document text
    • 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_off0000dc84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f49b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49B 10692 bytes
SHA-256: 6a6517ecfee29f83c87410c07f5af2e00c06c902f62f91337dd6c359592e04ac
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 17384 bytes
SHA-256: 21d7ca8184ad995345f5509cd15604ff790501e0dae5ea129a7939dcb18a7f83

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