Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afde22ecd921df4…

MALICIOUS

PDF

91.3 KB Created: 2021-08-18 02:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1bcc03f22dc42abbe4eeeb8611a3faa2 SHA-1: ee7725dec25b9ecafede3adc3fa8567ec17add1e SHA-256: 7afde22ecd921df4a3279c097e6cd246060f84617a68109860df9c3a78311d1b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://drafthe.ru/uplcv?utm_term=am+fm+radio+app+for+android+without+internet PDF link annotation
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a75e6a3818e625371de401e7df000ac3/suzixixewubumugewana.pdfIn PDF document text
    • http://amajyuku.com/files/files/64729657263.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5192d8bab---wuxezewamitunodobumazeji.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202108170610446085.pdfIn PDF document text
    • https://binhvi.com/upload/files/dejozinipemotev.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/35390068882.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/jegakalokokiw.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbfca736d0b---2454864438.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/71688897360.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/e833c09697a17f8b0c304f18d78a1d0a/fekesubagubefodegoseg.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/m8icv2ndhetpppqii58hnlecs6/17743783542.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/41050bb30545373a5cda7fd28d6d8586/guxixadiwemogevej.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/4be35a737af389a075ee2b74ed787fdc/99237097723.pdfIn PDF document text
    • http://servmed.net/userfiles/file/48936726647.pdfIn PDF document text
    • http://denledmpe.com/upload/files/lutamizivit.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/tipal.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/342831d6949a9e067312fc3f8bd752d3/50774509896.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d4090fba7---felunujopejetawupepebo.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d77978fb4---numodenimetasezu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbd1fd28c9---vonabipukegevamimuzov.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/51258131204.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/jupuxizujimex.pdfIn PDF document text
    • http://freetds.net/userfiles/file/kufogepudafukiv.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/jorenibekoridugumelowife.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/xalegogeser.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 20120 bytes
SHA-256: 29aa32524c4826f249bcdcf1aeb05beb15c0ff429f37a4da78cfabecbecec083
font_02_sfnt_off00012f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F01 10716 bytes
SHA-256: 71348c5185b0bbda038f0f7a3ee4c0f4b7a67be7c9bb1948a88420a246e7077b
font_03_sfnt_off00014769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14769 16852 bytes
SHA-256: f70ef041a208d2aa01c36a64252ef53aab948de457fe1df330ddb83dd2800829

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