Malicious PDF — malware analysis report

Static analysis result for SHA-256 234c492e767ed326…

MALICIOUS

PDF

75.5 KB Created: 2021-07-15 12:04:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0da86cde1e0b559d775dc3358bc63a3f SHA-1: 9f45c6b9dda2d9523b81ad2c6bc7fcc03d2479ab SHA-256: 234c492e767ed32695800b48b55a3c450521f0165e31f618b6a9b0933a082490
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the URLs and the PDF structure suggest it's designed to redirect users to malicious content, potentially exploiting embedded JavaScript.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://chetanaus.org/bheru/uploadfiles/file/dutumidujibokakif.pdf In PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/luporivunegobi.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/87101890572.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/sufewidofux.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf05cb848b---69449719949.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/7375732916.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/boxidesuxoneturege.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/igscqnek0ff9jd5vsp8hi7epd6/21475503067.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gmks53vnteiek78dnqkpk80vum/38870930500.pdfIn PDF document text
    • http://grandbarnettfamily.com/clients/a/a0/a01b80d98e57c38af56892ab55e7d82f/File/40634601188.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/wasekaro.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/kixagale.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090753c032f3---xuzebuxipizigixoludofa.pdfIn PDF document text
    • http://jamessham.com/admin/usercontent/file/dizawug.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/zusexoselixifoxonenot.pdfIn PDF document text
    • https://pavimenti.pl/web/uploads/files/naxagafami.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d88a0f878e8---woxusilawotamegeke.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/47c67f98bf5e29695ff8070c06f5bce5/61230185117.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/rotonuzatevapuxotilo.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/88803118807.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/narupelobupubewevemed.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/61a63be024ca160f9e685071b293e56b/30897235226.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/21fca772ce206c3f91d3c74ed66df2a1/kimexidewoxewa.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160775ec364610---63113341735.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0441cbcae---65943677741.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c10bb16987c---tuvig.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88142207633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=2+pics+one+word+answersPDF 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_off0000c5f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F2 16532 bytes
SHA-256: 303e999d0fd801428bb267dca31e00a401af48effd5db8da832a2c11a8b74d42
font_01_sfnt_off0000f0a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 10472 bytes
SHA-256: 05f80a1c53db10ae08ac2de471694df2fd3169f2aacb2c0d50b24b55c1301ea8
font_02_sfnt_off000108a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1