Malicious PDF — malware analysis report

Static analysis result for SHA-256 350a7021ef222f43…

MALICIOUS

PDF

91.1 KB Created: 2021-07-03 10:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3c53c9ac3c59d4ebd7218a3cb2074ec9 SHA-1: 6ea80efafd539246a7cee3d38538f3b27f702c03 SHA-256: 350a7021ef222f43ac9117cfbd60f65afe98881cdc68fc397723310680a7f106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and the 'link farm' heuristics confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chcial.ru/uplcv?utm_term=rights+of+preference+shareholders PDF link annotation
    • http://mxagproducts.com/upload/browse/file/mubote.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/metivi.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/banajekuduvubifevuvemoni.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/73a45d1349ee1ff964db6bd82819d49b/78784146547.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/68964204294.pdfIn PDF document text
    • https://miet.hu/kepek/gowusimedibakowoxedetof.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/40kjcm01kn3tc0l5qgqmkckl1u/dumutatikevikesug.pdfIn PDF document text
    • http://brlairport.com/images/file/jakalobibawolepega.pdfIn PDF document text
    • http://ithalattagarantibelgesi.com/resimlerfiles/patexebevolefixuxuz.pdfIn PDF document text
    • http://altadirezione-consulting.it/userfiles/files/46182610946.pdfIn PDF document text
    • http://westernmaki.com/uploads/files/23764010364.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608723231ed16---zejuxozekarakogamazafapo.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/32b2226a0875856740fce8f3332dc9c7/57688504409.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b79fbb8c2e---91279711022.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160982a31ee222---wabotifovavi.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f392d61617---wojifuvozoxupatobubiderow.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/ed24f91e40d5faacf7165c2396fb5ae9/fanipelewi.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/46943952777.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840f7782b59---zogit.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/1d1517cf6199a45327bea90200de0b82/zusutadamujulu.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/likukovur.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/1ec0b7f3cd3cd02f3bdb313ff34fd179/51399281890.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4D 10944 bytes
SHA-256: 7b476eba8d4cf8b86dc5a438eac891e8ab72d45fc3ea480cea68bdee9653e205
font_01_sfnt_off00011668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11668 18992 bytes
SHA-256: 5dafe142ba70f0242c1d706787e9500b2a44806962e66ba6990b8f538c832991
font_02_sfnt_off00014727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14727 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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