Malicious PDF — malware analysis report

Static analysis result for SHA-256 801be62f97e3cfb0…

MALICIOUS

PDF

97.0 KB Created: 2021-07-19 10:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b1b46a59fd0f57a6d67ee4d5e4fca767 SHA-1: f4f64a4100c47cba8d053fd3eb6a8b75d3250f07 SHA-256: 801be62f97e3cfb0ae646592d4a445233fa9227c8a5c512cb0baaac1de16a839
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 other PDF files, many hosted on compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a lure document designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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://topinsolventa.ro/userfiles/file/lekogije.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/t0n5mo4u8qfsmtp4buv6129r3f/73767913924.pdf
    • http://rts-3.ru/upload/files/55787869649.pdf
    • http://zkojicin.cz/userfiles/file/jijujugalije.pdf
    • http://fygl.net/uploads/file/121637424960.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160995b5c59374---tobamiwezifefotasuwalef.pdf
    • http://aptatravel.com/clients/4/48/489dad2d2d8436d4c085fc0ccdc2d1b3/File/23176778711.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/8068cc55f722bee45cc41fb4b6f4badd/jawiwezixitet.pdf
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/48587159430.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608aae1cf013a---fidotesud.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f53b044b---tubuzasij.pdf
    • http://watthaistuttgart.de/userfiles/file/41707916571.pdf
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160764bb4c91a4---vasozotu.pdf
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/bdef7878c370d582120dc3a29d2ec97f/58931603636.pdf
    • https://murtenhof.ch/userfiles/files/28188447202.pdf
    • http://bhs1966maui.com/clients/64750/File/89255824578.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/fa6u8uhhocehrmt8bjvp3hst0s/19331612894.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607730b7596f0---bafovagidika.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9d3abdb8b---88816064152.pdf
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160f22e33a49f3---84232014036.pdf
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3kd709dg35e7l1peencbdalk5i/78547198381.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/a64120c3f1090c0be1a80dfd14f34beb/rivelimipodin.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16082abcf184ec---40080687492.pdf
    • http://duancanhotot.com/upload/files/vusekoz.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a87d89c0f0---pewonosipovikisunovifov.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/f1tmon8r5voi4cui6c3atgk0f5/xilapemaledone.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=best+free+manual+camera+app+for+iphone
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010043.bin
072a5ef18119ffe1d65f919067b1db78972259708ab1782f6f2b2c972543c3d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10043 10900 bytes
font_01_sfnt_off00011950.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11950 16792 bytes
font_02_sfnt_off00013162.bin
c42a529d31536d550000d50b623359417852a613970eec9d0f4a8765da3638a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x13162 17200 bytes
font_03_sfnt_off00015e35.bin
e896d0c9c6509c93731645541c0836c845742b74f7fde2e8ff5e94baacc6a6a0
pdf-font-stream PDF embedded font (sfnt) at offset 0x15E35 16632 bytes