Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0bc2c4fdb7cd970…

MALICIOUS

PDF

75.5 KB Created: 2021-09-23 22:17:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ad86f9050584c7471450c140ec1b32b2 SHA-1: a6ab05bb06defcb1cddebbb8d35c636cffa6c3ca SHA-256: b0bc2c4fdb7cd9705de87cd18bc7dda0a39f6c4919bd5293d0929e0d1ae0292e
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 WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces the malicious nature of the hosted content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614175f8457d7---numigexej.pdf
    • http://murzilka.biz/images/uploads/file/61829364634.pdf
    • http://lexen.ca/userfiles/files/pifadezojuwikom.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/9a4e6222874fcc6df9de740311987542/dexulifamusugenuwige.pdf
    • http://specializedfacilitymgt.com/public_html/userfiles/file/73355432900.pdf
    • http://www.cerathai.com/image/upload/File/xewojoku.pdf
    • https://fancybox.pamlskovnik.cz/ckfinder/userfiles/files/mopameniviwepupufubax.pdf
    • http://lukoilmarine.com/ckfinder/userfiles/files/77506041957.pdf
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/39128248911.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338da843c7c---32014372953.pdf
    • https://kuraniterbiye.com/resimler/files/jenoruvononogemoxunemet.pdf
    • https://probidjp.com/ckfinder/userfiles/files/20210911_063242.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161407e0789de1---pozipetirubiwawejovinof.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ov74e23eg3shf1a1qt7rvl9j5/xaleduduro.pdf
    • https://scalper.ir/data/files/file/85597974147.pdf
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/tokuduzinef.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5bc094f8e---65833303678.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16133e89bd4e66---kaletapo.pdf
    • https://phu-komplex.pl/pliki/file/65161658186.pdf
    • https://serwisnawigacji.pl/userfiles/file/24369216647.pdf
    • https://akvanova.ru/sites/default/files/ketabefij.pdf
    • http://live-net.it/file/66330710685.pdf
    • http://lindseyderence.com/userfiles/files/87863153334.pdf
    • https://argumentua.com/i/file/moxir.pdf
    • http://autosoftware.company/autoresponders_images/files/mixixogizemuvatubilixito.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=apk+homescape+cheat
    • 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_off0000c484.bin
81dd3348224b854b41ec88925275ee105512ad1f7a76c2afed8b8d62abd4ec30
pdf-font-stream PDF embedded font (sfnt) at offset 0xC484 16940 bytes
font_01_sfnt_off0000f082.bin
c029a17d655cc4408f500c4fb34cef58e61ddebe0a47c54f0241decd5a256e7d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF082 10368 bytes
font_02_sfnt_off00010819.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 16792 bytes