Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1b7970f7fce7c2…

MALICIOUS

PDF

87.0 KB Created: 2021-08-14 13:03:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 38f0a1a562ef30e066fe31e9afac32ec SHA-1: 490e4d9977860f025029d27ad38f6110d9ac5a76 SHA-256: af1b7970f7fce7c292910667a712943bdfe50048ea29e79ce443f7487e5a833e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of multiple external URIs and compromised CMS upload links points towards an attempt to distribute or host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=do+you+need+to+read+the+driver%27s+handbook PDF link annotation
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/sf0m25u8upfppas4ms4posq37u/zodawujoz.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/608tqbd8n4ul1i55jtv7dajh50/60620773894.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/wezipurorojadatunepozoje.pdfIn PDF document text
    • https://www.ijestr.com/ckfinder/userfiles/files/21362211693.pdfIn PDF document text
    • http://surausa.com/uploads/files/27088487883.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/v3sd0l8vho5222nrc7l1c6atv4/31390459927.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d20f0e22865---xolosodu.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/xunitubakujodakis.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079305a1a183---91743346415.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/e1b5e365db5446125a74a2852f2f182a/kojerusedoguse.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/159sqougvoon7eig377pdio4g0/62282939768.pdfIn PDF document text
    • http://timnhanhonline.net/upload/files/15323368375.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/70473308267.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-17/20210717064540773364.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a34589e8c59---tevusonovebivajemusajo.pdfIn PDF document text
    • http://ssujaxchapter.com/clients/83257/File/varavanenuzelufakan.pdfIn PDF document text
    • https://morabia.fi/images/file/17543527340.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ada9182782---57528375478.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/7e2327b1726142b60263de125f8ce4c6/34009324391.pdfIn PDF document text
    • https://datajournonepal.org/files/10472578267.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/nizilekesapetaj.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8e29452f1a17eebf35a5f98981052d70/41229402335.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_off0000ed64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001057b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057B 10844 bytes
SHA-256: 4492e3c8fb140d89533e4526094fe1e7345611096822a464d5056368d38e13eb
font_02_sfnt_off00011e8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E8F 17232 bytes
SHA-256: afc0b038275fe2476c2fb02daabc1e2de18dc4e462f4001fd5ff3c6bc9fde520

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