Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3208af2f9c25902…

MALICIOUS

PDF

137.5 KB Created: 2021-07-01 15:35:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4261d130bdd07465321daac5a79e51bd SHA-1: 22ebf84f2fd4884f74aa7b40816a6bce4db154c8 SHA-256: f3208af2f9c25902f154b25a8e4a2d14e098fb63ddadba46fce272175e7b9658
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. ClamAV detection and ML classification further support its malicious nature. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9427

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=poison+and+steel+pokemon PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/17b015ed604202a2d36e5b0d5743b780/gukibadinasobekiginodemek.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/39334072359.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/65500480531.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/9238087978.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/sujopo.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/53383174136.pdfIn PDF document text
    • https://avayemehr-carpet.ir/data/file/69555729974.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/fagesupowoje.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/jopawesuribuxuxu.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/7j1oj4uj5nvq5bh602uv7ffke1/voririnenejesizavedoba.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b174cd9a0a---sudemawunijaderuzepatazi.pdfIn PDF document text
    • http://beateromer.com/bilder/file/lepajasifagofisazo.pdfIn PDF document text
    • https://grandegroup.net/files/62485124448.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xegufadazoves.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a981ee9f1cf---fopadiniti.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/0fe64778c5e27e4209cf38645c536722/dowategusul.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec699e6708---79784246957.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/b1ab07ac72884b4298f20d0989e037e0/zikamurokegokokudamifata.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/9b5a108fe57eefd93a82fa043ca5e80a/74485091555.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/pumopamekolufepur.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/6061157809305b06c60dfa50e2dd18fc/novefewonisesep.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a47995d6a9---kozagoxejakaxe.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/85320611085.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835fbce8e17---kalil.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfb7dd8796---fenozaf.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/ccdb758f9411963a4c777c1c73114b7c/22668161284.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17F54 19536 bytes
SHA-256: 0723236dce5126c0c33f29df114d34706a72591533b75c8ceb2fbc2d1efd9792
font_01_sfnt_off0001b189.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B189 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001c997.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C997 17720 bytes
SHA-256: b7aed421657470fb42e204da478d85c03d4296b50eb3969950d14f3c72b5c76e
font_03_sfnt_off0001fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FED8 10544 bytes
SHA-256: 8166f4e69531fbba5a00bb580ffe18dbf4108012b1c0d9366072c9c151946ad8

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