Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cdca8d1ffd3a510…

MALICIOUS

PDF

76.3 KB Created: 2021-09-01 08:28:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37d3ec711203c45dca6c64b33d70dca9 SHA-1: ac43398c84ebe309a2c332bd99c89b3a3cb3444e SHA-256: 0cdca8d1ffd3a5100c37aa4cd8eb1dd256d1e37ba9066112aa3f30a382087838
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of numerous URLs, some hosted on compromised CMS platforms, suggests an attempt to redirect users to malicious content or phishing sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which may be used to facilitate the phishing or redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://mzlpro.com/web/img/podborky/files/30857925338.pdf In PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/juhr747e2q7to44844q1uln9si/lujujogodagufudaf.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/kigujogukudezidigaze.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/89428858840.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/d4tcrt2cuat0muk5uijfq3mcsb/18300489456.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4025fdcae1f4661172cf136d84f11c88/xosezuzidigepe.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/3f99b86fc8fd25941eb6eef81b5b1f2e/rivaduxoxunugizilud.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/lubijagote.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c66c0270d3f---28052126694.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/d8pqv4fndh4jgcjgce7pktnahp/savafukupeguxefoxipe.pdfIn PDF document text
    • https://xn--z4qq44i.xn--kpry57d/upload/actfiles/kuvarapofiwurirefavazat.pdfIn PDF document text
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/88933767260.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160799d0a2d8ee---80766646294.pdfIn PDF document text
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba7db5edbe---38970560366.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/dodutir.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc8e626cbc7---musosutazesitabujupo.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/sepivitu.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/hnip2t36fgu5ceq8no8ch0n827/kedofuxavokazawok.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c61fb12856e---walazixaper.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/paledugurixarexazasavu.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/bubemaki.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/db9319d9a69e265060501332d4ae0648/97941671207.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/14872899341.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/55903998860.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2ad216d35---nuvomamepudanene.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/isifoligunixegom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=curb+appeal+companyPDF 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_off0000c809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC809 17256 bytes
SHA-256: 3d2fbbfd4ef67044ad30d4186913172fa69464fad30eaf3b3b8763fe0e5eb161
font_01_sfnt_off0000f425.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF425 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3C 10560 bytes
SHA-256: 4b6f4bcc7a0a166a7283ba828425c9932a8a8f6e27822d1271107fd425a727fd

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