Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ea3684aeba54123…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 08:33:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e74e33b080dd21528566039d280070d3 SHA-1: 31baa7c3a5f2a9a4dcd259c9628d6ed6140d88b3 SHA-256: 5ea3684aeba54123e491629d4dcd4a7f08c78c04c9d92ffb77c6580f84b34e89
116 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous PDF files hosted on various domains, many of which are flagged as potentially malicious or disposable. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext, aiming to trick users into clicking these links. The ML classifier strongly indicates maliciousness, supporting the assessment of a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 http://files.ibiza-ferien.de/file/bitumojaledegukojekibetis.pdf In PDF document text
    • http://toanthinh.vn/webroot/img/files/tolebobejexamugiz.pdfIn PDF document text
    • https://uroci-kursove.com/userfiles/file/zadaligewesifunajup.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/a94f4ac2703dd77eb1c573914a471acf/gaterekikegumebivinenalum.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/jelopiv.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/26206123551.pdfIn PDF document text
    • https://digireg.org/upload/87424752720.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/51981611044.pdfIn PDF document text
    • http://vallovin.it/userfiles/files/filozoliwupiw.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1884e51995a12c2473e8bfcebd68a41b/kokatezegato.pdfIn PDF document text
    • https://vettercycles.ch/userfiles/files/paresogidodusewosazivapad.pdfIn PDF document text
    • http://com123.vn/uploads/file/zakiwarixilavo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079f340795a4---togozukepuxafinigobexis.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210825_71FBDE90A8E25665.pdfIn PDF document text
    • http://skncn.com/u/files/63535965222.pdfIn PDF document text
    • https://aonetreks.com/uploads/file/9533229364.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16077742589391---lovutejudu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608b26a50feb7---67117702377.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607a21c01a9c4---budupexuzasusajanuk.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/muxebuvuvurij.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/vozatavurezobejaf.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/jemanojifadasuratep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=dog+store+near+mePDF 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_off0000f270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF270 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A87 10316 bytes
SHA-256: bb1890b72c69148e1977eb7c7f6c0733f627b736b129b49734531955fbd4518f
font_02_sfnt_off000121ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121CA 16980 bytes
SHA-256: eabfebb4550e37c5f5131d5bf65c86408b86b4550fbf0c6792bc0504de6339e2

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