Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ab1ecc1662cb2e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 11:52:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9a054960a5d4a8f999dce40082531b1 SHA-1: f71ca36d23318a4fa04b3584549f218f09e02c03 SHA-256: c6ab1ecc1662cb2e5265a07a0d925a42b9d7e5e9003a3b8b39859c693a5b4cb0
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a callback phishing lure, directing users to potentially compromised websites. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest an attempt to deceive users into contacting malicious actors under the guise of resolving a financial or security issue.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://nomylo.ru/uplcv?utm_term=c%23+manualreseteventslim+await PDF link annotation
    • http://fisioterapiasuzzara.it/userfiles/files/45180055755.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/3e4952ab71d02c2453e472c9915c5c9a/sapebuvutosovikodasenuri.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/2545c56d23650a249a46323164c9be80/39629022528.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rululofosi.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/90985960279.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f91fb65feb---97789112448.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/58284008236.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/tovigum.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/97386863294.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/putuke.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/34b3b8d8932833526c6a7e46f4e5c0de/laxirejorebiduwobawom.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160d40bef6c891---puwuwojenofu.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/2dd8ee051edf27135abe1164488f7fb9/zamidatu.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6481b9c672---pijip.pdfIn PDF document text
    • http://kmkonsult.cz/userfiles/file/29865288378.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3e5d428667---12928201379.pdfIn PDF document text
    • http://ackerviewguesthouse.com/userfiles/file/48717098544.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/zadipomuriwuzep.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021062306231673499.pdfIn PDF document text
    • http://brlairport.com/images/file/97872818340.pdfIn PDF document text
    • http://rivieahk.com/clients/5/51/51325344bd1517f257d6959d5350918e/File/finipakinebijixot.pdfIn PDF document text
    • http://jkohut.pl/file/xidefidewotu.pdfIn PDF document text
    • https://kaktutzhit.by/uploads/files/widipowapiwizox.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_off0000e0d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D7 18840 bytes
SHA-256: a33fba428f092e05f7a9a1a9cebb7be9703e39ac0d607b2cde8eba2d01e78072
font_01_sfnt_off00011128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11128 9104 bytes
SHA-256: fe4a9ad32d6d12da45ce8861a1e6e511df5579fd33367a5c4d1c9e774d301804
font_02_sfnt_off000123f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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