Malicious PDF — malware analysis report

Static analysis result for SHA-256 d76fb6643ec94d76…

MALICIOUS

PDF

85.1 KB Created: 2021-09-17 19:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7765559f38adbc3cf6ca5c67a6a200a SHA-1: 305d519b69a1ee8040d29939038e764a34b2d459 SHA-256: d76fb6643ec94d76fb61356ddffe76171ab7acef1275115d39549ca12dc4bd4f
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of link farms hosted on potentially disposable domains or compromised CMS uploads. The document's structure and URL patterns suggest an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cructi.ru/uplcv?utm_term=face+off+max+app+for+android PDF link annotation
    • http://seychelles-resort.com/images/blog/file/birufedazodufasowulim.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139f525d5369---ginewirovapajib.pdfIn PDF document text
    • http://vswet.ru/f/mijomog.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/0nn65eod133p62jtt25isl46ql/99862648568.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/rogesikapemelata.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/folabolujo.pdfIn PDF document text
    • https://windscrm.net/files/file/43051101865.pdfIn PDF document text
    • https://afmiletisim.afmiletisimajansi.info/resimler/files/20635528724.pdfIn PDF document text
    • https://lmbri.com/WYSIWYGImage/file/25724945649.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/lefukotijosovido.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/53020216584.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/dobemebinezatedunoxabe.pdfIn PDF document text
    • https://mollis.rs/files/91694376882.pdfIn PDF document text
    • http://unseretochter.com/images/file/bomepi.pdfIn PDF document text
    • https://motoralbini.it/files/file/49959323171.pdfIn PDF document text
    • http://makaroma.fr/upload/file/53378496949.pdfIn PDF document text
    • http://houselandia.ru/files/70578902769.pdfIn PDF document text
    • http://boletos.luzservicos.com/ckfinder/userfiles/files/41408622264.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142e960e5fb6---jaziwenefofejatexunaj.pdfIn PDF document text
    • http://video-cycling.de/files/file/jevetezogomunusaxowaseli.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/lufedodetideguxedetun.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/sugifulosekatezonuz.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/97668413435.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/wodebakewa.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/wameba.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_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ff8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8D 10548 bytes
SHA-256: 2c560e3288058d38fe284a830b4e4a5eaca9758080c070e0e1b04ade2267007c
font_02_sfnt_off00011786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11786 18280 bytes
SHA-256: f02d722de12a970386d2d86e2d931a1680d02728def4e0093d8c4e02711431d3

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