Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b530dee3e7d1523…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 04:17:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7b86ac0038d27081bd89e79ea939c5d9 SHA-1: 96766227d5c4e0e1b04c3e08955bf7be73df3563 SHA-256: 6b530dee3e7d15233615a8d1485dd47860fc6b5bb7b877d26e53373e0469b954
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 websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=fluke+381+clamp+meter+manual PDF link annotation
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/54d26298169c61e0cb59476bc0adac15/69656457297.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/76042766449.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/asjcrumr01b9inc0bke53oaqf0/39601697041.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/07/files/210713161730.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5287bbd58---fudabilitusok.pdfIn PDF document text
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/i7nlmii67bqpsts534o8as4bb5/juzikudidipo.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da46935a330---39204878334.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/dupawumewimixiwifomonigo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/7235fdb7e9f11c62410357c90f1a7187/fotomefenadiw.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/2c3011174891e6d0b16af259a565ec49/99673254555.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/90320030524.pdfIn PDF document text
    • http://motorlustor.net/userfiles/file/64547836801.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1621298007.pdfIn PDF document text
    • http://alanaf.ru/userfiles/files/fagezefafivuxapimin.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d89e9eeaa1b---gagibumexote.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/godatiwokanusuzodud.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/govadafumuxopazapabadodej.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/63054351822.pdfIn PDF document text
    • http://mlead.net/images/e/file/vutajowisafegujuxab.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/xugowosemo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705028c9f80---rekadetaxunali.pdfIn PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/lijafativ.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a09f6e93884---virikaxop.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/pijafejusixabinokebuk.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_off0000bfda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDA 20140 bytes
SHA-256: dd468a265c3c547b699f33038993fbf9811a325cbd91ecc38deab40ebbd517ad
font_01_sfnt_off0000f49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 10756 bytes
SHA-256: 12c0581799cd24fef8feb242923b50d411662d71b5efe247f7a5e7b08fbf9fe1

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