Malicious PDF — malware analysis report

Static analysis result for SHA-256 70e907ed92011e85…

MALICIOUS

PDF

91.0 KB Created: 2021-07-01 12:12:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cecda0d2000b75857166c48d16581aac SHA-1: cbbe2a9358f815df05aa8ad3bed7f61d65b10cbe SHA-256: 70e907ed92011e858c25b1d6dbccfbf7163fea0cfcef73651f174fba537a76b9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, designed to lure users into clicking malicious links. The presence of compromised CMS upload links further suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://grawerlik.pl/userfiles/file/37593264106.pdf
    • https://lacecinella.com/writable/public/userfiles/file/98389586527.pdf
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607561adeb453---tevitujejudotimapaxawev.pdf
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/35e8ddf0bb43a4e75b852819f069f2aa/fivabolepewasijujuwomapef.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/e83936527bec6629806d5650f2ce947b/lutigupeb.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2d62ee56a---96665369103.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccceb7615f---67627107865.pdf
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/88834611410.pdf
    • http://pospatrans.cz/UserFiles/File/56127190431.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/87464728581.pdf
    • http://hasici-pristroje-eshop.cz/files/file/repunalakizojunufimux.pdf
    • https://callalilyvn.com/upload/files/37563140982.pdf
    • http://msslink.ru/userfiles/files/dodanojimifepojixom.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160be16edb0d7a---tedabisawaxaxod.pdf
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160885ef447d39---jokidebe.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/7141f5592dd6616586e95558b45b0a09/83772162002.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9f81b7cb6---76278011423.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c2b027ea72c---32248517971.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160856e683baa3---8584902892.pdf
    • http://amphorabeautyclub.com/campannas/file/79354694603.pdf
    • http://marathon-gexin.com/Uploadfiles/files/vupafomivakodekenesiwe.pdf
    • https://oklogistic.lv/upload/file/76658873563.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160984b1028933---keresivuleguxita.pdf
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd44f979e1---59583579816.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=kgf+chapter+2+full+movie+with+english+subtitles
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/52f7b03f8d7443499a24df777ea9b2ae/dadakuwamerudone.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_off0000fd80.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD80 16792 bytes
font_01_sfnt_off00011597.bin
d3c33d33f72542fb4e471a621928747ba210aeaab633badf3b9427233e20cce3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11597 11428 bytes
font_02_sfnt_off0001305a.bin
c771b92d612b1829cca464b1ac914419a063425b6a1a6c147c4a6e642562c3ee
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305A 17380 bytes