Malicious PDF — malware analysis report

Static analysis result for SHA-256 2642631c94c87534…

MALICIOUS

PDF

69.4 KB Created: 2021-09-04 19:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a893bc443f1402501fbb3cce886249a4 SHA-1: 0aebb2d2fdf2d1513619e8adab4bff5abfb740a7 SHA-256: 2642631c94c87534766366730e1f9d9c772f97162585e3f63069f104224f4242
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-heavy nature and embedded clickable links. Heuristics indicate it's designed to look like a legitimate document but contains numerous links to potentially compromised websites, suggesting an attempt to redirect users to malicious content or phishing pages. No scripts were extracted, but the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=picadora+moulinex+123+manual PDF link annotation
    • https://wineart.online/userfiles/file/78159284337.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085592fe5e69---paliwokoli.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/10424644389.pdfIn PDF document text
    • http://entiambalaj.com/upload/file/6224883163.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/29041826537.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/vemifeba.pdfIn PDF document text
    • https://angkagenap.com/contents//files/sijilobuzunewaj.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/22110975248.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607751614e6bd---7511732150.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ecebef3e3d13dfc47c166f71d0621472/22946697769.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612bda2ae2b6b---66612125549.pdfIn PDF document text
    • https://umartravel.com/files/posanizakiteb.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/mufinuliwukitomiso.pdfIn PDF document text
    • http://storemisr.com/uploads/files/zulapazizeg.pdfIn PDF document text
    • http://turatabor.hu/media/xikidepejinofidak.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e7e614b36f3---69293642582.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/fe8fb55f334c62c1de2c93ebd00265ba/wurosuwozusibavokukuvotov.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4dfa422a7---87007213889.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/7fad205bf0389bfb7dac317de25fe37f/xesuzesodanumidoku.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/a672786479dc258ac06b009ce095e49b/15001718888.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///87210008363.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a84e29d3---69812317162.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9d0057ab1---26511334149.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3936bd7d2---matinafe.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_off0000b510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB510 10812 bytes
SHA-256: 41013bbf4dfa67a028d9daddb918ebac76eacf987da02a1e4f3e15fc57ecbaed
font_01_sfnt_off0000ce11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE11 13668 bytes
SHA-256: 0c98a9188347bdb3d18e905c58c22c2d4bff3a981dd22a29e4fb6dba481c9053
font_02_sfnt_off0000efa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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