Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73577bbc7581c15…

MALICIOUS

PDF

90.9 KB Created: 2021-09-03 03:45:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7c0b8ae6230ad5c69a0bf98354ba9223 SHA-1: 7eec325f6aee417650def30c997912e688112477 SHA-256: d73577bbc7581c15ac0426da58a3ae50a2fb9da47531918cd315e373fb1b8875
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly indicate the file's purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9d99530a7703473f6628d8cb05816fbf/24086671152.pdf
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/usi56ngn5n418nek15c18vqh34/3292582213.pdf
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/3n0b0d478r3c5qeg3tqliqn3u2/sowodunor.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/3970297ac0b99be1e516f1daf2263100/suwatasilesupawifoj.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8f438239d---ririxikas.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/ef40bbb6e16a24eda9c2764d6bfe3a4e/38822287299.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/77389737473.pdf
    • http://xedaptheduc.net/app/webroot/uploads/files/kunodasumumasa.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/219563423cc967a9c6308388d4a5e066/kepisutexowodojotamavo.pdf
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/7840955111.pdf
    • http://wisdomtours.net/upload/file/jabarifikivulibunarigobew.pdf
    • http://klhl.com/userfiles/file/difenobubixu.pdf
    • http://balmybnb.com/t/tutorfirm/uploads/ck/files/liwuxotofidi.pdf
    • http://ipublicity.cz/data/file/76697096226.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9652f0b7f---xidaxibaxeragox.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33c68a0ea---mufatona.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c74173142f3---kolizowor.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/608f9c3c156003e58a7985d534ac758f/pozafopawivepezo.pdf
    • http://archimax.ch/dynamic-images/cms/file/46148649547.pdf
    • https://www.geya99.com/ckfinder/userfiles/files/80756447781.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/1db68f9064616253633d57bd37280d63/rupenurebepesoxogutarop.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/dfdj62aqg19cja2200j164db9b/64051446547.pdf
    • http://galluccifaibano.com/userfiles/file/genubupanakeban.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=translate+pdf+from+english+to+french
    • 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_off0000fb46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB46 16792 bytes
font_01_sfnt_off0001135d.bin
afcbb507bd02bddf753c0e053aefd45fa3d814bff776528693d24dcd4662aa65
pdf-font-stream PDF embedded font (sfnt) at offset 0x1135D 11028 bytes
font_02_sfnt_off00012c97.bin
9d92809e962a30f82232f1a0a6949c54e2d701439175501235d6ccc4cc8f74c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C97 19140 bytes