Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb503aa3940fbdeb…

MALICIOUS

PDF

83.2 KB Created: 2021-07-03 04:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93e6493c4e3f4f9fa40d781247619889 SHA-1: 8c13aadc2c1ba995dfd6aad2c730aab0f86507b0 SHA-256: bb503aa3940fbdeb1614b4f9cd198e7c7dfc284fdcd5ca32b6d742079486b2e9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests an attempt to lure users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://eyupsifalibitkiler.com/resimler/files/leranazopogusulip.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f94a6413b7a1b4646f759c87baaea2a8/befujodukasipural.pdf
    • http://forter.vn/hinhanh/file/34825877774.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4128e50773fcddfb9c4dc685455d3523/63465303083.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4b244f5ef74688b5e0ab3d09fa385bfd/17455495825.pdf
    • http://arslanemlak.come/file/6479933419.pdf
    • http://cichanski.com/Upload/file/nepimetu.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160724ccea408d---fimevufevasetejavojumis.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088f98718dce---jogunadibizuwoninu.pdf
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/bec26fa39101a46229b220777d952196/60648279796.pdf
    • http://debschoen.com/userfiles/file/zakug.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/69264b56630756fd10a9f425aec28e9c/54895720676.pdf
    • http://wumag.pl/userfiles/file/12732883187.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ff54c3ed2---xebikag.pdf
    • http://tuzvedo.hu/elemek/file/16127783763.pdf
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3498d7186---pugesotamavirupilig.pdf
    • http://builderall.info/userfiles/file/verexumabodo.pdf
    • https://topclassgreenery.nl/images/file/ranupolun.pdf
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/113d829b5474465af6ef37facc2d76bd/82560081748.pdf
    • https://wegofa.com/userfiles/file/pasisamisevapavaki.pdf
    • http://hotelbelleepoque.bg/userfiles/file/joxozagominovovuwisapaler.pdf
    • https://bestofbucerias.com/upload/file/xalatexuzedujaxirurab.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=principles+of+engineering+economic+analysis+6th+edition+solutions+manual+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_off0000df89.bin
ac2b72609da5e854a2bb4ddec4f9e4a14535dcd4b399f899f462e28178a76c03
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF89 17164 bytes
font_01_sfnt_off00010c3e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C3E 16792 bytes
font_02_sfnt_off00012455.bin
5fed409a9a3d9a90fccde907ca44b3f7684d194efb829c5cee016734b96fc6c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12455 11452 bytes