Malicious PDF — malware analysis report

Static analysis result for SHA-256 18519658771e230c…

MALICIOUS

PDF

129.0 KB Created: 2021-08-10 14:08:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1ad2f889461bef387f21d63cf16a588 SHA-1: 0dd6fcfb797b7ba5320e7c29ce6b472f4fe1ef01 SHA-256: 18519658771e230c60b45b1108b902f28e18917f63283b9e7b3283b43d332dab
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the heuristic findings strongly indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/53cff2f0d62d2d3b4ac14baa0443e6a9/28299655127.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/5771f457a78cb34cfccf47b3c0dc87b3/raligisevawo.pdf
    • https://dobski.pl/userfiles/file/gizegurerakufawabojom.pdf
    • http://commsoft.nu/demo/ktb/wsmbilder/files/12423057788.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fccff4a4b18---tunawanawazema.pdf
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/8c2417a5087a3cab0de5550dc11f1114/21319376202.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d701bfe8e18---vatulutose.pdf
    • http://kfnmdg.com/upfolder/e/files/20210723154931.pdf
    • http://vipforiraq.com/userfiles/files/zeparemefigav.pdf
    • http://modamoda.nl/uploads/pic_lib/file/dapapafo.pdf
    • http://ducthoaudio.com/upload/files/tenipimunotu.pdf
    • http://easytravel63.ru/ckfinder/userfiles/files/15799023197.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/90944950029.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609cae8cd7b71---kitidilekekipafagutopu.pdf
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/108fd0a169f392a9936222bba9f70227/bonegomavamuwiza.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1a72fab719---bosokaxosi.pdf
    • http://szpitalstrzelin.pl/userfiles/files/20981037339.pdf
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/19798749661.pdf
    • https://mycocoa.org/images/upload/files/gebikuvovoreranaruxug.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0762b7924---vapafezisidepiwixotafog.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1607584a174c01---rinaxedur.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=geotechnical+earthquake+engineering+solution+manual
    • 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_off00018621.bin
51e281ae1d5143424c96664dce8d5fc85f28e6444d7e4a9219e824ff6c502d7e
pdf-font-stream PDF embedded font (sfnt) at offset 0x18621 4156 bytes
font_01_sfnt_off0001963b.bin
368afb97b73eeda0c92e021bd15ee587136742b997c9d41aee14fff5a047a2c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x1963B 11052 bytes
font_02_sfnt_off0001af7c.bin
16c2e474b892bb8835117db71364f6cd2f51b8b130c2b8b6a0aa26034a3b1105
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF7C 17480 bytes
font_03_sfnt_off0001dd18.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1DD18 16792 bytes