Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4a6058a3e505b1…

MALICIOUS

PDF

70.8 KB Created: 2021-09-01 14:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d013717f9beaee8f4b5e6eb4f9f00dc SHA-1: 7c313858fbee68601e0944ba92fd8a3c63ec40e9 SHA-256: 6d4a6058a3e505b161ea1086a5fa83783b4228908bd333761b75bf5360c5253c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as https://laborke.ru/uplcv?utm_term=apple+and+pear+allergy, are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://laborke.ru/uplcv?utm_term=apple+and+pear+allergy PDF link annotation
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160964fbae0eee---15260937560.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/95150676354.pdfIn PDF document text
    • http://csc0516.com/userfiles/file/20210803180549_zkhwkv.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/veribusuvafebijofukuwasi.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/sodisovuvejuwanub.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/77651965151.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/vi4rfs0dkqkbs31d5bgb7sdrn6/18669925297.pdfIn PDF document text
    • http://kronikarp.pl/ckfinder/userfiles/files/nunoxa.pdfIn PDF document text
    • https://xistenze.com/files/files/lireniseselizotunotaxaso.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/2248116915.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610305a75c96b---8436025.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/80393555137.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160caa3b4c0ee0---bedalizoge.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/37783922751.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161283f05d0b4c.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607064fc29e14---fewuvijidisenitonir.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/92007307973.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/g40mmg905t0q17vgmjij7ncful/20092944287.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/jenana.pdfIn PDF document text
    • https://latework.cz/soubory/99596883944.pdfIn PDF document text
    • https://pachetedeturism.ro/images/files/nixakivuratedidi.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/vpnm81v1mltt8ss6n15ea7m14s/lozesixidipo.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/tipexilot.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_off0000b892.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB892 14936 bytes
SHA-256: cb903859bd1ddb6c9837d41e04bbb7d419a1e3c5e3fbe5d5faae686e8ef3d4b4
font_01_sfnt_off0000dded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDED 10184 bytes
SHA-256: 87938b6accb32098bc7327150f2db86e9d859f7f756c7294279241f437c87a11
font_02_sfnt_off0000f49f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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