Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ddfc77e4269a35…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 20:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e6049c853a81cf9189d7195f1b0a20a9 SHA-1: 3ac0e278ef32ad681c121f83ba4ddfbee0e2f232 SHA-256: a6ddfc77e4269a35fb204a75dbcbf89bd20a9affb89536d621948310cc2f64a6
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 a link farm hosted on compromised WordPress sites, directing users to download files. The primary purpose appears to be phishing or malware distribution, leveraging a lure related to downloading applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://pistant.ru/uplcv?utm_term=download+movie+apps+for+android PDF link annotation
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161344c3dd1b06---pofezutuwurasodagap.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/5049227824.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/litabeliruzokepewivexi.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/xalitilodanozili.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/35776836306.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142659e4a3ed---15667323805.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/dutimaguf.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/97353234541.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/16495054960.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/a9a925b3fa65aba981c3fe6c602bed8b/45591441222.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/finatibematab.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/3a81786125b3e17cb0128ebd6e129dad/48018151526.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/rivetesodogu.pdfIn PDF document text
    • https://starfoil-mail.nl/uploads/wysiwyg/37655230030.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210905130102_1948653394.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/gejipip.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/jirebunimipijag.pdfIn PDF document text
    • http://indikino.com/ckfinder/userfiles/files/94078782416.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/zagodosajis.pdfIn PDF document text
    • http://prosefkuchare.cz/userfiles/divejavimosano.pdfIn PDF document text
    • http://donauwell.at/userfiles/file/jinanakomotibepogu.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/35368419623.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468f0b87e63---47947643779.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/77643526454.pdfIn PDF document text
    • https://pkmoscow.ru/ckfinder/userfiles/files/warexijobolumo.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/7548333181.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_off0000bad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD6 16560 bytes
SHA-256: 71b06da68dc5cee28d6e233c6ac66474de7eecfb592ba174299ae041edd59fe6
font_01_sfnt_off0000e50d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE50D 10712 bytes
SHA-256: 4409ba504f389224dc765db235ea5bbd080f4779a2db6ca7131e88541e8eaaae
font_02_sfnt_off0000fd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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