Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f9b1011b4fa53d0…

MALICIOUS

PDF

96.5 KB Created: 2021-07-10 08:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3668ca335b96dfb3c1f415284963e843 SHA-1: 0b5b6aa401ff347dae54abcb15549311f3748383 SHA-256: 2f9b1011b4fa53d080fb6dac0031831f3d04a218229a086ff5a768f1ebcf60b5
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on compromised infrastructure suggests an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/ef1a12ddc5d8305759e5f8f5d0ffa7ea/tolenunu.pdf In PDF document text
    • https://footballsod.com/images/ck-uploads/files/kaxifasixi.pdfIn PDF document text
    • http://desagresbrts.com/clients/34568/File/33631722610.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/41224028847.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d652645e2---51080688124.pdfIn PDF document text
    • http://ideas4mypool.com/userfiles/file/21881888372.pdfIn PDF document text
    • http://didula.com/img/file/damigixasijexiforufadabaj.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/31413183128.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/gijomifobomokikur.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed36ee91c4---balixefubanabutazoxa.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608f7993c20cf---gokitokakuzobimimix.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/62cd049fda31dd3ee074fc188e1cdfdb/lufatixobusa.pdfIn PDF document text
    • https://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/kaegqhdn6h1tqlke2mnn5btnoe/51195640041.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/77839890438.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/8ac581c4249130ec0eb9fd077d439c7b/musovinikazesoro.pdfIn PDF document text
    • http://askort.pl/Upload/file/dumabofalijufezikivol.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/dgehq78r26caddutum567phqn1/73885420702.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3a6ce771d---55941869081.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607445bf53939---mekilarupakafogix.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608076d52f501---botogiwobotubeba.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a4b3587cbbda66038a86ab99e666cce6/mawepujetapoximugamoz.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/36032290032.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6a7d80bd9---32574477795.pdfIn PDF document text
    • http://teplospectr.ru/images/files/sibevuwumumamurowew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=congratulations+for+completing+5+yearsPDF 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_off000116d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D1 16740 bytes
SHA-256: 86a6e2a1668b59eb8c97282c0d187f13effb89edd12fbc9c5d430f8085af577f
font_01_sfnt_off00014245.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14245 11204 bytes
SHA-256: 46c431614c231ef661386dac27177feb54fef9fc2a12bb59584df9d39f14e028
font_02_sfnt_off00015ca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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