Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5b2c3078421a33…

MALICIOUS

PDF

92.6 KB Created: 2021-07-14 02:42:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2fa279067ce789c5dd08a5fbbaa510c4 SHA-1: 1c5b434f838f3b177cc30b35838089afdddb6fa2 SHA-256: 5d5b2c3078421a3322ec5208fcd93a3190316bcd713ca6819c763248b6d9b829
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely contains malicious content. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://nomylo.ru/uplcv?utm_term=curse+words+that+start+with+c PDF link annotation
    • http://abwalabamaave.com/uploads/files/dusegiziruvetevig.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/61058220117.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a615c6cb768---kimemaxufo.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/8f368d97e004316e4a1b94af7ca249b3/pezisodofibodifa.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607363b896f63---14902344069.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/iu0317l730vb470nmlb2pfk4a7/gaxil.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/2714637369.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/93430919764.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/59123533011.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1608626eaef60d---jivonava.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/90892689809.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097a21d3431d---mezelojezewumoxunuruz.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qv2u5kkvpue53ddpi3u09n3fbo/womafijewukoj.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/bafivajiva.pdfIn PDF document text
    • http://jarosi.hu/files/file/52169558687.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/lelekagepavisotulaponozel.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b860784ca59---55651304758.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/50312194730.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160912749ed81a---nukeboripar.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b5d2cc13---gemenakugoxubofidotepa.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4e5eaee298---toferad.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/d93deb77b7ce5acb19cc327c16e78f75/widisodulotapisebavim.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607881959f7dd---49351054118.pdfIn PDF document text
    • http://toeicspeaking.net/_UploadFile/Images/file/vigadilomusaduxiletune.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/hqt48nulbr9q7r8ik98iss58ah/43799488673.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/nepugolipixodiduroxirif.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10468 10532 bytes
SHA-256: 4c0264c2c390c79eb5b010ec89317d87392618a37242788a708b6666bc715122
font_01_sfnt_off00011cab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CAB 18712 bytes
SHA-256: 49140dc7da5165f2feeac348d71efe5482f25fc9ae85a47394431af116bf2ce9
font_02_sfnt_off00014ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1