Malicious PDF — malware analysis report

Static analysis result for SHA-256 68ac3f85ea1d06a8…

MALICIOUS

PDF

80.0 KB Created: 2021-09-08 10:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 225709fda0265b6cad0764c9af2b0f74 SHA-1: 4c8151c78645628dfbd7d9ae2990891bf069e1e9 SHA-256: 68ac3f85ea1d06a88d6ffc3d103c0c3c995c231005575a9f805f8aef570caf1e
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to potentially compromised or disposable hosting domains. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting its role as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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 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 http://bangdientunhk.com/upload/files/venomuwowogopugugasegazo.pdf In PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/67155363645.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b825a76d9---sapobob.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/cg1udcriil6jr0drsqrd533ua3/filikozazezuxo.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/kewudufusuwafaxabinepoma.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/situdirelafowotu.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/42807509181.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/tinaja.pdfIn PDF document text
    • https://flour.co.uk/ckfinder/userfiles/files/zozuwuvurovakivugamir.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc113472d8b---87648259705.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/51l6ke5p27hfi454ad1ra7vi63/wemarukivosegerubun.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/gekuzijidefogutadoduxidi.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/japidemufubapubejavosiw.pdfIn PDF document text
    • http://ncabhsa.com/clients/875427/File/15628748076.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3122e4d58---rovupovukegagokezedexiku.pdfIn PDF document text
    • https://tavio.ru/files/file/91498887103.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/befeka.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/kojadugobupov.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/21c9691fb287562b64b623b3447cce51/rivefegodadap.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/11879348519.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/4mdhtmum2af2r0pf438033mk1d/23641852752.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/nadigipibex.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/faperuwej.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/kejajelefifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=calendario+aprile+2020+pdfPDF 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_off0000d601.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 10496 bytes
SHA-256: b42e99954022ff9a23c1697f323e1da623c6a81f7fd5de81ff790b45c58e5314
font_02_sfnt_off00010603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10603 17340 bytes
SHA-256: ff9538b2b53aab73f2f75679aba2661098e1a183507dcfc15b901073c533f1cd