Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b8b4df904ef2a0e…

MALICIOUS

PDF

109.5 KB Created: 2021-06-27 01:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17fe6dfc971cb0102028a0604f6e0275 SHA-1: 0499b438b45f97f727df1214defa43c611d1ce32 SHA-256: 3b8b4df904ef2a0eae1060c53a072ba5feae055b68ada9ff114d900bfb42d5df
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. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests a phishing or malicious redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/h3mdbd1cq3ni3nienv4rmoev87/59523971893.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/7decc04cece4aab364d5bc9220441ca9/20971404365.pdf
    • http://penzionklara.cz/userfiles/file/98353603529.pdf
    • http://accomplishtheimpossible.com/userfiles_ati/file/wojodezekabaguxorugupawo.pdf
    • http://aryajob.com/user_upload/file/fujuxabeponebitomifavane.pdf
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a7e8eb7d7c---16558592067.pdf
    • https://thinkglobalcompliance.com/ckfinder/userfiles/files/kilobebeparimobulunod.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/254qt1sk4c7034idvjs5pgc2jr/reteludat.pdf
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/67921488671.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/5mt65jrbprsj2fl9hce2ahhcq5/vefegosirukevaj.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/fumebuni.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/738a44cc2586f177a4de40461a5521c3/muputowikaz.pdf
    • http://anandamsanyal.com/userfiles/file/duzibefuvugilevawis.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160786838e264e---panivexonatadoxo.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe6dfc828c---xanotegaxezonoguf.pdf
    • http://jarosi.hu/files/file/53208432886.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc98dac2baf---degesaruga.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/js0gfegoegtsd4jufla792hlc3/zipad.pdf
    • http://jevades.com/aircraft/fckimages/file/63667224452.pdf
    • https://flyags.com/editorResources/file///96975381562.pdf
    • http://kapli74.ru/upload_picture/58722492589.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d32c374ccc---muwuridabemajezubuv.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=in+a+young%27s+double+slit+experiment
    • 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_off00014273.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14273 16792 bytes
font_01_sfnt_off00015a85.bin
814ef4694f9615d7a4b3e15a05568373ed015a544458ea984f1bf8d8c4fd2466
pdf-font-stream PDF embedded font (sfnt) at offset 0x15A85 19668 bytes
font_02_sfnt_off00018ee8.bin
69cf09b6ffff0a76fd95877d7e727a9072460e4dcca72e82147c63ff04c9f890
pdf-font-stream PDF embedded font (sfnt) at offset 0x18EE8 11176 bytes