Malicious PDF — malware analysis report

Static analysis result for SHA-256 3439963f853ccdc1…

MALICIOUS

PDF

81.7 KB Created: 2021-09-06 01:59:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d746eaacb100c5efbaf239d7b426948e SHA-1: 7fe8283bac675ad894f49a3775520a20971168c5 SHA-256: 3439963f853ccdc17f14d96c53f7fb0c9fe1103aae986d66f5c4c2b1fcdb4f92
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress sites and disposable hosting, suggesting it's used to redirect users to malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of hosting potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://o2ashop.com/ckfinder/userfiles/files/1761505998.pdf In PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/vofoweselopinujamajuwojij.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/goxagiradametonoteg.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/c4371he28dih7efpudk1hmmf60/38406737080.pdfIn PDF document text
    • http://bbgannualseminar.com/clients/6/60/607ac775fa755cf068047886b2bbe24d/File/58022865137.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/magjd942v35f6ajm6gjqb7bfi7/80782135136.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/werabiloxugim.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/77021608482.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/fokajisimamulepeporilodi.pdfIn PDF document text
    • http://flomojapan.com/upload/files/delawakonafajunu.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad427e2d2bc---vatumezekodivem.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gubuvekuvisesub.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/uqe22lcc8urctd0lf137sf60t0/jonerujesuzonuna.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/kuxiwufule.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16095e0d0f1c1f---39804282989.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/xizomawogavalemale.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608122790d6e7---bokozigeso.pdfIn PDF document text
    • https://luminex.pl/upload/file/domajoganexepebiwupa.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/f9r7fj4b3724tesjuhein0sdl1/71775955108.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd96993d95---81408865843.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610741565ae83---xuririnizusatemesadadigox.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/33630038600.pdfIn PDF document text
    • http://iuoooo.com/filespath/files/20210831165959.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pathway+book+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_off0000dbb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB0 10388 bytes
SHA-256: fd4040d23557875070e91baf4acb5e6d1befb9a1da0f02537b7148cb1fb99f0a
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 17708 bytes
SHA-256: e8bdfa86fad68359cc8a605ac0682213327644aa2c5223537de9b910b0782f88
font_02_sfnt_off00012150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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