Malicious PDF — malware analysis report

Static analysis result for SHA-256 605541925dc86210…

MALICIOUS

PDF

80.3 KB Created: 2021-09-22 10:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f4c09d5c1cd9897e67c012d009ed9c08 SHA-1: 3108e4d811a8541f1af8d5e47d6a52d96da8caad SHA-256: 605541925dc86210d8a9c10d03f2281eb339a6597f0125f5aa1f6abd8f19e8bd
164 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to distribute malware or phish for information. The presence of a 'download button' lure further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=geometry+dash+apk+free+download+ios PDF link annotation
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/c38f6b7e7bd8cbfa8a69ddc0b0725fa6/jiwafosuxeja.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/bukotogix.pdfIn PDF document text
    • https://vietnamwelder.vn/uploads/news_file/jerojirosogexapafedidutug.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021920_1146_393.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/xabemopemomagotu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bbef77b49---reravudojopajafobubo.pdfIn PDF document text
    • https://wrd13.com/force/file/44538063035.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/xujedizizoxegawu.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/80557736855.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/9973498065.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/momasipoposigadupo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/62072bac5d046360bccba28a2fb32e1d/pifuxuxijutugetag.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ace9e76066---57753349127.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/6357162608.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/45296788329.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b904c54732---48968015022.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/vavemuzazipefepel.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/050358a18549b8bebb362062ef6a7d05/84527852258.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/32998481117.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161360f4b9fb44---lazezibited.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/97335447069.pdfIn PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/mobam.pdfIn PDF document text
    • http://bresky.cz/res/file/sumubozigenuzixikafox.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_off0000d438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 11096 bytes
SHA-256: c4ee90077ab7109ef07bc6fa55e40079a5699eb17b7c0bd7d815ae56d2486131
font_02_sfnt_off0001060e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060E 17752 bytes
SHA-256: 36b7c8fc0cf13ea7aed26773cd67d32585432fe722a35286c382e85493c0364d