Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac18389101d0770b…

MALICIOUS

PDF

82.1 KB Created: 2021-07-10 07:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 019711e3b877e46b90b0687ad1714d64 SHA-1: d8a45e727563cbd675cbde1d1e0666d581599b72 SHA-256: ac18389101d0770b7692572744ea31bb6259f20447e1bb246ba0c6baf0a3d61e
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 uploads or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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://huntic.ru/uplcv?utm_term=mariposa+meaning+in+spanish PDF link annotation
    • http://ahlhy.com/uploads/file/02172845668.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3631f121a---vizoboxesafulutin.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/zojoviranekitasedir.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/sikaminetipizudifanikugi.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efa96f0b68---sonilako.pdfIn PDF document text
    • http://yogathoitrang.com/quangbasanpham/app/webroot/upload/image/files/kiruvipisonukugasi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/l90hnt2r4tp7gckcq3qqt73jmg/genubi.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202106242218049764.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/79875982578.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607171f212b38---4959166136.pdfIn PDF document text
    • http://holzweiss.at/17085597690.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/cl1drf10a1h0eu75tpfntcj6e4/vafusuzubipizisusina.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/7b675ef975eed2ed749fe0ac9c15baea/lifev.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/wufixolojaded.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607be5e341e3b---firumivekokobokazefe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5784e25334---33047325526.pdfIn PDF document text
    • https://alutat.com/data/file/31198789776.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/xovopuxujikogetodetepu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd11d56b2---jilinuwuxotenik.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/fkc5d8s061trdgnel6agk86u68/60961867711.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/gumevaxatitadusewivefupe.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/34789654133.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9914eee904---22681271599.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/52c4f19db7b4f2fa7e0af37890f181f2/bemujezuvo.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/25706026500.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010a56.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10A56 16896 bytes
SHA-256: e263d79d5054dc2212f9ab1b8a85b767a261fe95bbc4a4468dbd6aeaa330d794
font_00_sfnt_off0000c3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C8 18652 bytes
SHA-256: b897e9d20d07852be75e395b1b1e429b078a148c5f38654c4bfa4bc0a15e6f8f
font_01_sfnt_off0000f28f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF28F 10548 bytes
SHA-256: a772096d6d233491bee07b51d96fe04463255710b312b4a925378067a15fa1c2
font_03_sfnt_off00012294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12294 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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