Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cc80bd6e75004d…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 09:14:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61418fbffde59d370e6dc8433cc14581 SHA-1: 2c96edba7312c51f54436930a88e9e017dba92bc SHA-256: d4cc80bd6e75004d27c69fd5da927302b99ad74d3f83a654290d1d71a1531bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links for SEO manipulation, likely to obscure the true malicious destination.

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 https://garglob.ru/uplcv?utm_term=histology+slides+for+medical+students+pdf PDF link annotation
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ef73d20blbf88ud3799av1g2n/mefesamanebifikeze.pdfIn PDF document text
    • http://veterinariomauracotti.it/userfiles/files/50854771867.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec2222cb9---xebijonaxi.pdfIn PDF document text
    • https://mabuksusu.com/contents/files/xewedesu.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b740b47397---381780777.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/18921921492.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b06a3928cd7---72275453089.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021070115453983.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/8rsu1q41d43o4hsvuri1dkpans/fabogeduganel.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6f1093f5a32079e7e7861609b3c85054/gibifurotazisoxu.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/piroripavuwuz.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/b1765efa9bf00abb638f9e993119d70e/28687539812.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdb9fab6d1---fewux.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/fasugozukagudimesaguk.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160741e699f352---99552131777.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/dunesixobaviganikusexoza.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/cacd86ecf88b196fd040bae69b8eed31/nuvujixazuxu.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160903a78ac4e9---22668508470.pdfIn PDF document text
    • http://gat-asset.com/CKEdit/upload/files/nunalibukofoxogofevasanuz.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160a92a1004220---70561810119.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/41619062909.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/xotuzakireju.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/b38701bbe24e2ee517f867092967aad5/sevizokixadam.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/1cd3bb691d20382836be01ded9e05966/58187923184.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1i0aavc4klvhcss8iu09j7fjc7/netipuxesaso.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_off0000e9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10207 17852 bytes
SHA-256: f632e5868dcd371c722d8b60c53b782667fd881d5149bf6285162f7dcc0e7fa7
font_02_sfnt_off00012fde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDE 11168 bytes
SHA-256: 6d1b9647fbb02878b01cdf120e2e5df512b06fe1c7ab5dd0c3546b50c06e328d

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