Malicious PDF — malware analysis report

Static analysis result for SHA-256 7130aad2dd7a1534…

MALICIOUS

PDF

91.1 KB Created: 2021-09-17 13:00:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: af408789a9ff6ef0f897d89816b987b4 SHA-1: cfb5c7424e24f644e6fec6cc6631a1efb22c26b0 SHA-256: 7130aad2dd7a1534fdeb710e3b972b75dc33ca5d44663030e234a2caec960bb0
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://pistant.ru/uplcv?utm_term=spice+cheapest+android+phones PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613abd80f1e08---manumisifuwakefiwokolidik.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/jomatipakugon.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/nijamidobedazefete.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/84069893608.pdfIn PDF document text
    • http://hanstime.com/userData/board/file/25925005853.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/6689284985.pdfIn PDF document text
    • https://orsam.org.tr/paketler/ckfinder/dosyalar/files/23860777199.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/senexerowaxajek.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/vuwatarefosizawomunutape.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c524c86491f729c8c94313169024d3bf/98988414726.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/48349283822.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613da5252a763---kuxagigetaxebemebife.pdfIn PDF document text
    • https://bem-sa.com/img/file/33380942138.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ace1df3fd6---11205771542.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/54773413404.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/pajitowosebod.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/mewofajukurubafer.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41049484429.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/61565krtslee09utpg9a5dmr60/firijesexez.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///mafopejedibizemagekob.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/wajom.pdfIn PDF document text
    • http://eternoohydro.com/d/files/67417681814.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/bamez.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_off0000e840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE840 10640 bytes
SHA-256: eccb2feae2d6ea236803a2309c6f91ab5180660c55fcbc43370004fba90dbabe
font_01_sfnt_off00010085.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10085 17620 bytes
SHA-256: 1dfeaf00c7353ffe93c3bf692f53bb5dd61098a0f6368306346eeae516157784
font_02_sfnt_off00012ea5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000146b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B6 16652 bytes
SHA-256: 8969cde4b4a53a1daba2a78f74f159fe3210c9bac81d061a4976e121a23d0fc7

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