Malicious PDF — malware analysis report

Static analysis result for SHA-256 71741541b39711a7…

MALICIOUS

PDF

82.6 KB Created: 2021-06-28 19:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ef01b73b05cacb04623ccde32db595cb SHA-1: 304bdb6bd69eaf6af52b4585ecee8d270239aeab SHA-256: 71741541b39711a72e420ccf5919eed636068ca2579c95293380e2caa049c4f9
176 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document body is heavily obfuscated, but the presence of numerous embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing or scam attempt, likely related to fake tax assessments or similar financial lures. The document's structure and embedded links suggest it is designed to direct users to malicious sites or potentially exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/02ef08347ff354316344c1547b3af180/kawusenijedetedoligo.pdf In PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/a02a9aa416c48f8ebde0efc5caa7f529/bapaguzofopolowebuvume.pdfIn PDF document text
    • http://blissworldbeauty.com/newerac2c/userfiles/file/kilirowe.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/593391482.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608511aa040c3---73715744730.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/rozokovigotofixitazarun.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be03d41bb55---154013054.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/29563426669.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/roxigamajusumogozolefi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3f2ea29d7808737beea4e57b9af3d696/pavuvipije.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f0be28268---bagubufipiwefevukexid.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/6gfn8oan1sqdhv49s22n8i8kpu/geruravikesivitozip.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b81050baec1---xagupigikibo.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/beae4f1ae156d981b3320ce3d6b84fe7/41650911618.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/4d7ad3ed6988c3899e57a266294a0a3a/36801881355.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/japivoludobezukuzufov.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820b069a556---xuxitezegifemovilexipo.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/b1da44a0b31f6af7dbdd473ffe805073/15723249705.pdfIn PDF document text
    • https://migger.dk/userimages/file/53264121070.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/05m6o58ispj8c4c1j8acmn9dr1/63553671664.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/04ecd8210d8b73b8b1d8476a04d0a86a/wosodexoguzep.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccaca43e29---futarudunanigujozuliv.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/53c70c13dcc23c3509486fb3aade8367/lavalumozukurod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=pay+your+simple+assessment+tax+billPDF 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_off0000ddda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EC 17072 bytes
SHA-256: dc1dcae1031a8db8b5b19b2c6ca64d63d8b2475c20eb0b3779c25cca79d26655
font_02_sfnt_off0001228e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1228E 10872 bytes
SHA-256: 9ea63c77384de1d737ebaa825d065d7b45b30338857f799f1d4b93d5c2d893b3

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