Malicious PDF — malware analysis report

Static analysis result for SHA-256 e991f1281771fa92…

MALICIOUS

PDF

93.2 KB Created: 2021-09-04 17:44:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 06407cf6ffa26cf2029d211b9d045a88 SHA-1: aa76bcd9e29a18f196c7392c681910da02c0f76b SHA-256: e991f1281771fa9290e3573e2ab665e237d66f77f74c9926f06f0ec7b0ceed5e
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous external URIs, including one pointing to a raw IP address, and heuristics suggest it functions as a link farm, potentially leading to further malicious content. The presence of a 'download button' lure and a callback phone number suggests a phishing or scam attempt designed to trick the user into downloading a payload or engaging with a fraudulent service.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=memotech+electrotechnique+pdf PDF link annotation
    • http://exteractif.fr/pictures/2/xusilofezapuwo.pdfIn PDF document text
    • https://vr-spagna-20.effievirtual.com/galeria/files/85653379727.pdfIn PDF document text
    • http://runhouchem.com/upload/files/rifiketinunuwawedarurafow.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/29910613647.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/512ee462958301e58c379e2fb497d43c/bolojuxileke.pdfIn PDF document text
    • http://udclassof1968.com/clients/74076/File/returawilifuj.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/76137141993.pdfIn PDF document text
    • http://xn--dlek-5qa.com/admin/UserFiles/file/vokanitesanaze.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823f01747d9---dititadamiwosodewejofi.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/45444431858.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/lupoboresafuto.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/37568564548.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ts37n7u6l0hs07ogub1ollquod/vutuweke.pdfIn PDF document text
    • http://happinessgown.com/upload/users/files/podezagiwasar.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/qk7gjlmr8907f2rgjjjp5jur6m/92161497266.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/577e1d83a5f99f6b61fda256f1b0c30d/nixalizexaberubamoxu.pdfIn PDF document text
    • http://dr-onesrl.com/userfiles/files/30643229537.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f9d6dc6b2---suvuxozuzozero.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16076ebd53c96c---92008042001.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16078b54a702d1---xerit.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/jerudugelivopi.pdfPDF link annotation
    • 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_off000101b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B2 20216 bytes
SHA-256: 6a0dd8be015db38ffa8bcd5bf3c71b20cd050e31fd81bf9f0048b2401cf46928
font_01_sfnt_off000136d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014eef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EEF 10796 bytes
SHA-256: 3e2d234955b02f9e6ad940c0547db00e538e8e5e3652dd65c94e616a07fbd919

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