Malicious PDF — malware analysis report

Static analysis result for SHA-256 04a0afaa0d29a54d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-17 21:09:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bbe0ddb7384812ee23855dff223a7ab SHA-1: b2dc6457d6965d94b913b48786450406b7e91d37 SHA-256: 04a0afaa0d29a54de58867b9fa95eb16ab0199deb8d95b3360914919605415c2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a 'download button' heuristic further supports a lure-based attack. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://infrive.ru/uplcv?utm_term=thief+of+hearts+1984+full+movie+watch+online PDF link annotation
    • http://sotel-perm.ru/site/file/9587555819.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/161425cc30ee1d---17399100300.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/22139396541.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/fajozidowaruzuwewuriz.pdfIn PDF document text
    • https://warungmimpishio2.com/contents/files/44625139399.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jeponodorumolorizidajo.pdfIn PDF document text
    • https://stvietnam.net/luutru/files/90526186337.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210911011208_hbb6ka.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3cd25bd4f22ad28f2947c85a9484d16e/4247478.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/kitemogisekavuxodidomafiw.pdfIn PDF document text
    • http://trieuduong.com/images/Download/50972071314.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/57646686525.pdfIn PDF document text
    • http://dogable.de/userfiles/file/vefaturefunurevafum.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/29466467605.pdfIn PDF document text
    • http://canavesiobruno-architetti.it/userfiles/files/jasesud.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/27299853457.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/51294283158.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/wigubivefegome.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///2021091520958_175815004.pdfIn PDF document text
    • http://juha.be/_files/file/98340804617.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614144f21d95e---20318826390.pdfIn PDF document text
    • https://clickbox.ro/images/file/6091052401.pdfIn PDF document text
    • http://belovosushi.ru/files/57010230765.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/xoribi.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393da6e9f8e---95278193181.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_off0000ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED7 18716 bytes
SHA-256: b9dade1b9971abc54e058735725646bdb23560d6389ea3442d5e6187ca048a5e
font_01_sfnt_off00010f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001279c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279C 11320 bytes
SHA-256: 4b5295da8ae62bdceb5176388efe81e58e452b74b3b1b3834724b3a94fae8dd2

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