Malicious PDF — malware analysis report

Static analysis result for SHA-256 b496cf2350298cc0…

MALICIOUS

PDF

93.6 KB Created: 2021-09-18 18:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d29e4164fe79949ee750ce2417f1608 SHA-1: 7b9207a599ce425e733e73faf4d883e33bc06aab SHA-256: b496cf2350298cc0be873793e2d44c4f22f5cd446b5a880bf1ba41753d8adf04
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to lure users to malicious sites.

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 https://laborke.ru/uplcv?utm_term=apps+to+block+websites+on+android PDF link annotation
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ee587a4d0---45446145310.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/doretexowizoratagix.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/zapirijoju.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/bokorezexufiki.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/gaxopekisijixuvijijaroj.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/93992647020.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/52128761860.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/gdnavb7nmq6sv0uvrqqe5vhc86/rapaleregasojopopegujijit.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/fokiwejawotemuxadep.pdfIn PDF document text
    • http://efuegypt.org/userfiles/file/xofeta.pdfIn PDF document text
    • https://actor-conseil.com/files/file/65078150694.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/17484770425.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/mebaroku.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca6578911---71481452262.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2d26086a6---niwizefeku.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/razaku.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/812803167.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/rageneraluxixetiwek.pdfIn PDF document text
    • http://cnwt.mgo.cool/upfile/files/2021/09/11/46207630011.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/xerafegafedezegok.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/30821714543.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/doworo.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/48299207760.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/26051763977.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_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 10808 bytes
SHA-256: f7428b3c7a260c684451953388c0d4ce30d421a1246b5edf37571fd057bedd75
font_01_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 17812 bytes
SHA-256: e6fa282bad092290d4db9d25127ef159cf3a910dbeab2c94d30f3f20ef528cf8
font_02_sfnt_off0001505d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1505D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1