Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a3f5656592d4dd5…

MALICIOUS

PDF

103.4 KB Created: 2021-09-05 10:21:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4d260f754b47abf0513ddd8cb0b46fd8 SHA-1: 6418cd4c2379dc1245e9dcfee0f50cac1c150416 SHA-256: 2a3f5656592d4dd5563d5dc33ac96db5536f09d7c1ffeb09adc938f8c87358ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or manipulate search engine results. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

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://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608cddb80ad6a---65960537510.pdf In PDF document text
    • http://alfavit.tv/userfiles/file/fidomixuravuxigakupo.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/95862060579.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/cba7ae98b7227487a6c9d092e2b4b009/soropiwewidovinuze.pdfIn PDF document text
    • http://atrsara.ir/resource/files/birezuvu.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2a02de46cd---gavubuzezapevipuvigafilon.pdfIn PDF document text
    • https://shoreluxurylimos.com/userfiles/files/sekepo.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1610ecae78f47d---xizajuvagejiwavamuw.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160778fae80366---xokexokasifakalav.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/zasafogufiso.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8597bf0f4e---39656471755.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ramaxonu.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/wimodubetos.pdfIn PDF document text
    • https://kit-veron.my/ckfinder/userfiles/files/fizodijodadetujefijajol.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5f71402f1---sawonug.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/52368500778.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/xabutegakatorevutepokefex.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/vodikanovivazu.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/0dfb9318f2becceb763987a9c5057b6e/xomapetumikajafikadazixaf.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/potokebefadulalob.pdfIn PDF document text
    • https://chp-travel.ir/data/file/78033856915.pdfIn PDF document text
    • https://giustofiori.it/file/52344533810.pdfIn PDF document text
    • http://bmhs1963.com/clients/7/72/7286fd37811b7a5dece6e69924e4d5ab/File/14245044015.pdfIn PDF document text
    • http://simonide.org/userfiles/file/44475894535.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/58485988424.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=xiaomi+mi+router+4a+gigabit+manualPDF 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_off000124b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B5 10608 bytes
SHA-256: f22fb9814cf54f4ca7f217ec075a0978e4ef579c960ba2af132fd2b068948052
font_01_sfnt_off00013cee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CEE 21844 bytes
SHA-256: 029ea8ab96fffbb11fa593ad3e16337f9108a045f9032c5d3f88c95ced304602
font_02_sfnt_off00017720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17720 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1