Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5ac5e51eb8033b…

MALICIOUS

PDF

83.9 KB Created: 2021-06-25 17:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: df8e7b8ab9d4d218e10443884616a27d SHA-1: e1416f45173289b3b3c0c675e93a80bc723fffce SHA-256: cb5ac5e51eb8033b1a3217c4f6471655e6eca468ceb3e007ce3b426ff8600c44
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains. These links likely serve as a lure for phishing attacks or to distribute further malware.

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 http://asbufestival.com/uploads/FCK_files/file/86107605929.pdf
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/knq9v993tugdpbmiq98o58nja0/38701158247.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5f16813aa6007346988e87674baa9960/zajavetalirilepaxebobil.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c999661512b---83670335235.pdf
    • http://reutlinger.pl/userfiles/file/galukinuzutox.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/42d1c127f783b74f7e3102b871c4346d/rokojimedetimosese.pdf
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/zajodifi.pdf
    • http://anthonyvienna.com/sites/default/files/file/xiwagerolofozufaxisexajej.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076b9e660ba9---mebolobaja.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0b4152e9e---32177423613.pdf
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/1gvmrsa8e4jm89rci5u85k1iv0/dumasina.pdf
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/4188f8becb949ac34c6bee75fb67edc3/genutebumaxufel.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/34103037498.pdf
    • http://loscogliodifavignana.it/userfiles/files/mikasiriwige.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd9c2c25d07---fedetiwo.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/d30add3b6b5ac02cd25d55a0de3433f0/zoribuvugulometujutazidi.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/cg5d4vic7vaq2qlk0q6jsckc85/tipuzulivokulor.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=using+the+measurements+in+the+table+determine+which+unidentified+metal+has+the+lowest+density
    • 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_off0000e2fe.bin
80f8397d7adce8679bb163d7acf226545937fa2d36bc21d9f73b3ebb89a4a2d7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 17172 bytes
font_01_sfnt_off00010f0e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0E 16792 bytes
font_02_sfnt_off00012725.bin
79b448d66f8d0f0d8e89475d7e85a224c6194fbbc3b0f46d47f94bdbd430a9e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12725 11372 bytes