Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13a0b58fb23c719…

MALICIOUS

PDF

86.1 KB Created: 2021-07-03 22:23:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: acea4af5cd6c812f0e2241d42d1de257 SHA-1: 5244e3c09d062a5c2af20755bc73ad60d1db3011 SHA-256: e13a0b58fb23c719e7d54b2ed7872303b70825adb6463e5de9a363c8330e07d8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. Numerous embedded URLs point to potentially compromised websites or link farms, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://chcial.ru/uplcv?utm_term=grading+system+in+us+college PDF link annotation
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/3f5b9d75c6307ce813483186efad3054/81323612825.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/46191837048.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609380369ed5b---85616348164.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/torovelifisizo.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a859146ae97---retezunu.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ftd4v8fpsrrdtcjddkjual0f8g/tojab.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/pp9bgcofish68p8qb7cir9hbu5/79137122589.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/zejoguwupowudod.pdfIn PDF document text
    • http://saptpadi.com/files/file/43580297210.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c504a716a93---fupuzazapu.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/2e92c7d39adf974abf605bc3b801f0d5/fejowemavalogaxal.pdfIn PDF document text
    • http://buydecor.ru/uploads/files/24949876992.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/b2to5d8arpbe3653ie96gguvc8/ravijonuxugavuberizavuj.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/xofafatesa.pdfIn PDF document text
    • http://kbchina.de/upload/64268564304.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/hs19ctvc6hn94v8sg9rjhvtaa0/4973467078.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/bafofexutomenozal.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a8dd584f1---sejijekovamaweravar.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/taragifaku.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/kegot.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/xemuz.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/04b23cf739167bbedb94b47c32269ec2/6481284019.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a5dab92672c---taridixuzud.pdfIn PDF document text
    • https://lacecinella.com/writable/public/userfiles/file/jamupasinodaxa.pdfIn PDF document text
    • https://capitaleny.com/wp-content/plugins/super-forms/uploads/php/files/d8fc1e3dee1ddeaf6915ab5ade49fc1c/vonowibakefuw.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a79855bd88c---vejanujodisoworika.pdfIn PDF document text
    • 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_off0000ec96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC96 17252 bytes
SHA-256: 92abb354f6cd619921b2dc4556ebec59998c0621391ccf38e74cfdb07fd509c4
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 10968 bytes
SHA-256: d7cca802c763c45e320af8fe43e02a7d7c2f7bf7c04edbf7746225782d8ac139
font_02_sfnt_off00013318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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