Malicious PDF — malware analysis report

Static analysis result for SHA-256 d60ed557ef8f46f5…

MALICIOUS

PDF

81.2 KB Created: 2021-07-01 12:00:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 419503678b57dbb7c20726e5415c945b SHA-1: 6f1b2f7831e2b2afb01bd437bfa67930dd2f318b SHA-256: d60ed557ef8f46f5cc2c3683adbb8aa69fe51caf3a407223723b294091598fde
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to numerous compromised WordPress sites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure itself is designed to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6a578bee8a5d0a896b62794773f8307f/97605056889.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b552be91665e0b61d332fd27bf9c2f6c/genatijomi.pdf
    • http://smflow.in/admin/uploads/file/35470150223.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa91fc4395c---68424587640.pdf
    • https://brs.jo/userfiles/files/telavamitujix.pdf
    • https://stvorki.ru/files/file/belepumir.pdf
    • http://emannsltd.com/userfiles/72892540923.pdf
    • https://nbtele.com/en/cache/fck_files/file/sidamorozulixubed.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16079833337aa1---11502481203.pdf
    • http://sacoorhealth.pt/site/upload/file/zasajan.pdf
    • https://peilimineko.com/userfiles/file/devid.pdf
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/akjbnhe3u3aftcj14uiquobn19/fesoxifixibitaseguzezeno.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4eea42b5a---13232454053.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071c35f6d586---dajugix.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b93bf829c7e---ferifofanuvosafip.pdf
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1a9e320eb---dinopuwazopuzupupisoguk.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608d79f2e06d8---diwukerugusafuloxoxuxi.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/86alj8uhu7a91hgrcvg0foeq7b/kuwejubikimapatoperoto.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c151209d45---mexuwexekit.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f75f8d37c---filonex.pdf
    • https://socohoteldanang.com/uploads/image/files/79954932458.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe68e80464---pumivotem.pdf
    • http://wxhsbl.com/ckfinder/userfiles/files/20210629_180455.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a54b5d18a---13496014008.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=cuts+and+colors
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db39.bin
db76e7c88027396e487ce268904c9c0cd9108aa669967fa98df30aa62a59f50a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB39 17104 bytes
font_01_sfnt_off0001081f.bin
647c0abea6ba97655e9bca461802be4b467a901cff96d5061a5589809eab58c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1081F 10268 bytes
font_02_sfnt_off00011f65.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F65 16792 bytes

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