Malicious PDF — malware analysis report

Static analysis result for SHA-256 1729697eb3f9fcda…

MALICIOUS

PDF

122.3 KB Created: 2021-06-28 15:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 516684e04050d1bdedeec7e91bdfcd61 SHA-1: 8f624c0f671f8ec7030c9a77818d19ac64ac2c3c SHA-256: 1729697eb3f9fcda8d7adfe398fa6c840be62ca3f284309774901cbce1d8eaf1
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://turagent007.ru/userfiles/file/96285887008.pdf In PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/16087cca36a01f---2997964262.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/gupagesaxa.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/dab9e911a9925e4885d4e97222b409cc/51464086932.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/18714652956.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609077815760f---tetilebutupidodedidufal.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/5919807ad29d72b1e7a3a3802ec21b62/pudifisobojukonokajapubom.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/a44hv2hapm515556s4gq1oqnsc/vebusuwatipifokadusifubo.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc23ee7696---kinozazofawumobafu.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/bifolurakobepepirumutesi.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/56069887902.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160723e1b8ef91---20612608534.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/nujumekugowawoz.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/03d185mlh6urled38kg6bqsbkv/27539387118.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6vopniq30h1fugar012tscusti/92687106845.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fca54746f---49900759692.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e672564561---nepati.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8b2708eb---xilufovifesezemasafolaju.pdfIn PDF document text
    • https://akita-inu.lv/www/files/files/jofirobugazaxe.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609829b32e27c---gofifajasav.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/42c15fe957d1fd4f71075801eacaced7/debagej.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160d3819dd4e98---xefivejonodufefoteper.pdfIn PDF document text
    • http://amandamaitland.com/images/file/duxunesi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=i+will+praise+you+lord+chordsPDF link annotation
    • 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_off00017e72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17E72 16968 bytes
SHA-256: f7ffff872c08b9a71b78c81dbeb7b53eca4c95d4a8f44181c4a730f00c69b312
font_01_sfnt_off0001aac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AAC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2DF 10660 bytes
SHA-256: 63143beae77bce4d18ba2c8ed21ac88b54d634a8fe0bb6d721e060f8aa6dfa58

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