Malicious PDF — malware analysis report

Static analysis result for SHA-256 844685a39fa2438d…

MALICIOUS

PDF

145.5 KB Created: 2021-06-26 10:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b1b1608a75d28b3da0b9fe414ec0f1b6 SHA-1: 05f9d4ee8c30b7bed2c111a7fa61b68d65c43402 SHA-256: 844685a39fa2438d76d396e5b175bc641685e9c25df47cdac34639db44716d91
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised CMS platforms. The presence of a 'password-protected archive lure' heuristic suggests the document is designed to trick users into downloading an encrypted payload, likely to evade initial security checks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://synerhu.ru/uplcv?utm_term=top+notch+1+third+edition+pdf+free+download PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085699486014---31189084222.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/10372553549.pdfIn PDF document text
    • https://europartner2.pl/uploads/62761886724.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/12700612613.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/ed60a3572212abd5556854221460871c/wipamoramu.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607278c24cf9e---48956430680.pdfIn PDF document text
    • http://scandirent-new.ru/uploads/assets/file/78870242812.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea43d1d283---62987734883.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/qmcupvtruttuodi5sfqphnmqpa/81998408287.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02834840c9---suxaxomolomubikunosusutov.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/detatepuramotipefa.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/uluddiehdpabvb9d57ml14u27d/59476064347.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/xaxoxedudiwibitiran.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/5d2bb2870d90f8cfbdbe90151c47f41d/38516287151.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/dee553efb59bb5e4544522665448f0f3/zawimiwafek.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609609f5ef1cd---99934204108.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0f642d77b8---dedilabijuguja.pdfIn PDF document text
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/3aba2277a35b13ccae12c9ec4c1b2422/jizunovejokoduni.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/badubone.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/331f5fc084f4c3029a6b552656c8d6d6/xisavekukuwozolon.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160927b79407dd---soguxupoliwakunuvafobasi.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f65a345d9---xalegagadupebokawedojo.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f51e86236---kewuritaxaxetolo.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_off0001d3ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D3BA 10652 bytes
SHA-256: 431ba4bd08bfd629be1be4db48c22c86c5b16b3744ab12aeef6f6bd7c1559a53
font_01_sfnt_off0001ec28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EC28 21064 bytes
SHA-256: 92cdf0050fd5831e3e30e794fd279f900fbcc9372d3a4c362002e88a25a1917e
font_02_sfnt_off0002201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2201A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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