Malicious PDF — malware analysis report

Static analysis result for SHA-256 5db810487ff3ca17…

MALICIOUS

PDF

113.9 KB Created: 2021-06-09 22:12:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2b1afe5dc74d78460d762b2d802ecc8b SHA-1: 74a13e0989260b1dc0f61ac14a37125c53e9833d SHA-256: 5db810487ff3ca17d349b917b137681d3eca7e9a4b05b1f013a364ca7ce18717
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It functions as a link farm, containing numerous URLs that point to compromised WordPress sites and other domains, likely to lure users into downloading further malicious content or visiting phishing pages. The presence of external URI findings and the compromised CMS upload link heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=hotel+sales+and+marketing+sop+pdf PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b439f18965---14260846403.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01b881aac---53165271750.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ae570db54a0---31479589206.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/7a86f7401687428622c7bc8465101805/xumega.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a5eb2056064711c2b49c0d5f59aa3576/daxegekategi.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b37ece8b45---pedabixanigunore.pdfIn PDF document text
    • https://chp-travel.ir/data/file/podavilibosawumo.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/fuginak.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/60577457311.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce3f6e0137---14097485658.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a635a34e23e---wadojifukaxila.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/p2ffsp6puqr83k490m2f5i1sp1/37126290827.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/zudoxaneduwelezafekam.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160714624c871c---wonizegaf.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a005a18e344---papigugiwuwatopokire.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/26648472160.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed621af3dd---32776820784.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/nupafewisanobomemoro.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000151a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A2 3560 bytes
SHA-256: c4dfa9f890374eba075baa89adb82ad353c5dfacfe2ce12230561fd3cc32febe
font_01_sfnt_off00015e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E4B 5388 bytes
SHA-256: cb7fd6a15459813f8c915c722862d8ab887d145c955c087dd17730e13991bbe6
font_02_sfnt_off00017084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17084 14280 bytes
SHA-256: c0299c6fd9c7ddafd831340444e1ae59541aab861f7652742e3557d28f6f294b
font_03_sfnt_off0001a06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A06E 16864 bytes
SHA-256: 835a18d708bc7fdec0cd51c9e75079e87eaf7f7ff0481a3ba9f5421ab9750c12

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