Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8227e41f0dc6a6f…

MALICIOUS

PDF

81.2 KB Created: 2021-09-20 00:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29bb089b701540cb0796e916bffa0895 SHA-1: 62b3013c8de26694319f6e560b74b6379c9ab2a3 SHA-256: a8227e41f0dc6a6f49983864ae3024c741cb82f3ca2ec946809485346c18d166
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The presence of embedded JavaScript and numerous external URIs, some pointing to compromised CMS upload storage, suggests an attempt to redirect the user to malicious content or facilitate further exploitation. The document's structure as a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=best+free+graphic+design+apps PDF link annotation
    • http://www.uc-kushiro.net/images/library/File/25108507597.pdfIn PDF document text
    • http://musicincw.com/fckeditor/userfiles/image/vatufinit.pdfIn PDF document text
    • http://tmacfashion.com/ckfinder/userfiles/files/tonubuvejaviwe.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/93861634174.pdfIn PDF document text
    • https://bazk.info/public_htmluploads/file/vigenaroxobi.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/pevapowem.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/sabuxak.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/o6dvu3501jg3ctfahk7331mdr7/32453820132.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161336c6e8967b---99422751503.pdfIn PDF document text
    • https://magiccat.pro/ckfinder/userfiles/files/53011323889.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109120451589447.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/6143120881.pdfIn PDF document text
    • http://savitaco.com/uploads/images/files/48551627221.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/14693905868.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/37203003710.pdfIn PDF document text
    • http://robotsuk.com/luckingbros.co.uk/userfiles/files/43529413281.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/11762035783.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/sajebop.pdfIn PDF document text
    • http://energy-labels.nl/userfiles/file/5463676980.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6731ab0e3---fobimidino.pdfIn PDF document text
    • http://www.seminariomenorvalencia.com/admin/lib/ckfinder/userfiles/files/97671962041.pdfIn PDF document text
    • https://villamishkan.com/310renonew/front/images/files/tuzepa.pdfIn PDF document text
    • https://biholka.cz/uploades/userfiles/file/sekakejezakugebexap.pdfIn PDF document text
    • http://xingyeknitting.com/userfiles/files/73446901699.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_off0000da8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA8F 10788 bytes
SHA-256: 9845f408d11dc41e6e14bfc6737c26c8a9d643e9ccf8265c8574b58934f612ce
font_01_sfnt_off0000f32a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF32A 16884 bytes
SHA-256: e5c8646453b7f28aba44da1948f55d816ba54e08c6b6664ba0b8b95e29997fe8
font_02_sfnt_off00011ea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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