Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8209a96c8b1644c…

MALICIOUS

PDF

126.4 KB Created: 2021-06-28 23:00:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e72f9eecde70c8ff473e2218a30bc760 SHA-1: 4a1a853a138dcaa6234589eb4dcbf87628f20f80 SHA-256: e8209a96c8b1644cb825478be6eb622ce19eedf3c93ae8657baa9e2f40a5485f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute phishing or malware. The presence of embedded URLs and the nature of the heuristics strongly suggest it is used as a lure, likely via spearphishing, to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://inwebjor.ru/uplcv?utm_term=losing+confidence+meaning
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082840c45b53---38186557862.pdf
    • https://medprobr.com.br/wp-content/plugins/super-forms/uploads/php/files/f77103212f8addbe9603a85ef055052b/lajuwesozameseduzojok.pdf
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b74d8cf97d---megodivapowes.pdf
    • http://schnauzermountainminiatures.com/clients/17729/File/numikajetagiwefokobinug.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tc2vg3la539mt2bs7q2ot8gi2a/69353227704.pdf
    • http://thetachikappasigmaalumni.org/clients/5/56/56ac51e2ee760b54d3ff8b7d53c877b7/File/sojujebabulolu.pdf
    • http://aaaexpressheating.com/userfiles/file/22376671336.pdf
    • https://jobtiara.com/files/files/nevapoziluxufusiv.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607a63ee4e208---60877050948.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e207a9fbb---fezalezomuvotevokona.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a542b185b0f---joputejinul.pdf
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/10c1c618a2e5190dc5042055c3da64ef/46700354328.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/9ac110d3e4ff4af515f3e0e73e0de58b/ganukolotakan.pdf
    • http://jnnycc.org/userfiles/file/60108905261.pdf
    • http://blessingsngo.in/userfiles/files/51632130930.pdf
    • http://bean2beenefamilytree.com/clients/60578/File/mawupegonumuzanig.pdf
    • http://penzionklara.cz/userfiles/file/71160311161.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df7826ff12---lixukisolozifoxakojaw.pdf
    • http://goteneplast.se/files/images/file/lefemej.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/v807bv2or8buk3r2klrlvictc8/97648203920.pdf
    • https://weeb.nu/userfiles/file/73268690096.pdf
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2b4b50f3---81400075340.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d082de38f66---59235776442.pdf
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/16ab1e6a7c613d7b41c0798e3c683b43/sorewenewovejesezimagufu.pdf
    • http://royalgoodviewresort.com/Uploads/file/39343774337.pdf
    • 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_off00018db8.bin
c503a59d00a9225cfd2d6d1f696bc358e83f520de9ebb5d9be3803cf39323e88
pdf-font-stream PDF embedded font (sfnt) at offset 0x18DB8 10532 bytes
font_01_sfnt_off0001a579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A579 16792 bytes
font_02_sfnt_off0001bd8b.bin
5bb1089b607502d07576888808180e961169ad655ea306d068bf719713d4e8c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x1BD8B 17764 bytes