Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b7920607466cf7c…

MALICIOUS

PDF

84.3 KB Created: 2021-06-29 02:57:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbdaed7ac9e5cb818ce2ecc1e6d75d72 SHA-1: 508695f1a1e38c9aeeef367a2ce8e70880d8db40 SHA-256: 4b7920607466cf7cda8ad67b8fb9f606817ba6da1062f04b389807fbe466c9c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL analysis point to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607665fd18274---guwazuwejoj.pdf
    • http://www.fonfe.com/uploads/files/98210506495.pdf
    • http://mu-rrrc.com/userfiles/file/72357594035.pdf
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/rlut8o0trvdi6i8h8etbrklh62/temuki.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843efde842e---lotokogajiliwuboxo.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870f15cf64a---82714898608.pdf
    • http://aucoindeshalles.fr/menu/file/45180610142.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6038cca222---94130898677.pdf
    • http://fitnessklub-impuls.pl/uploads/assets/file/45740674420.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e7c0644fc---pemebizofifibos.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/q05s7cvnvbtlkk0s7r95usfr45/rofulajokozejujoro.pdf
    • http://occahomesearch.com/userfiles/files/32489855449.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081ffe66eadb---salarusepumaj.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e77632344---37785369259.pdf
    • http://angarakshaksecurity.com/userfiles/file/tizulexifamageziwud.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/c7805c291d0d47e92a0a2276f03cf5fd/tamadutofaxibetidexutosum.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/02516beb15716e7b8a1dbd00d41ff552/2535754907.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083ecaedfb11---pabivuxoduzulawuj.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab793f8c516---44207735050.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/7d0eca7beb5bc7bc66abbe64bc36b860/fokosoxonidejuvavemoxabam.pdf
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/f30i6bvp1qi82tkhroefjdlo9l/15560589256.pdf
    • http://kingsfinancialconsulting.com/userfiles/file/murofuxugobulegunega.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834522e6d72---78276998927.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=non+controlling+interest+in+consolidated+financial+statements+example
    • 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_off0000e662.bin
11535724d1d0bcfae889ab06712edfdd187cfc6e6572c9a47b0b4ea65a0cb4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE662 16692 bytes
font_01_sfnt_off000111b4.bin
8c06d8436878ec40b0229b844cf1dabc84798e56b61d93b77c01497c3192f31b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111B4 11040 bytes
font_02_sfnt_off00012b3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3A 16792 bytes

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