Malicious PDF — malware analysis report

Static analysis result for SHA-256 74fd7caf30e8c310…

MALICIOUS

PDF

70.7 KB Created: 2021-09-17 02:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f2002d27659c1ea180ab80b1e5da845 SHA-1: 58c15b5bacc12563d133b0eaada8385cdcf0ce01 SHA-256: 74fd7caf30e8c310c741a490e2924bac5917b62312237a4a8553656867c4a492
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a farm of links, many hosted on compromised WordPress sites and other domains, which likely lead to phishing pages or malware downloads. The presence of external URI links and a link farm suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=pokemon+let%27s+go+pikachu+rom+download PDF link annotation
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130edfe11a16---86252008113.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/6847ad1c894548ba8ba22e0374458430/31665101423.pdfIn PDF document text
    • http://uticachemical.com/files/upload/files/rusepebugulagexenodul.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/fewaradilodip.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/75851574438.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/gorulixizagar.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/1631831835558908182.pdfIn PDF document text
    • https://indiansabroad.uk/userfiles/file/3973405453.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/55683052369.pdfIn PDF document text
    • https://icbacademy.com/upload/files/34397439039.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090522152873499.pdfIn PDF document text
    • http://dungcucaytrong.com/images/files/38807591222.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/79298171455.pdfIn PDF document text
    • http://dmychadla.eu/UserFiles/File/dapupedad.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/64747900179.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/229b997913dbbacd1106f61f50a6174e/49986798132.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/fodolazate.pdfIn PDF document text
    • http://teraval.cz/res/file/40217389110.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/riraxuvexub.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/jebopokipadoboregi.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/3866a2c1d9a47614954c375e97f79e06/mujiwomi.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/33987022975.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/86116631372.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_off0000b1b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B7 11276 bytes
SHA-256: a9eb5bf9a9c4d3bcc0ba70a88bd4f63b3ed78875e0bc127055dfaed52d7e9e0d
font_01_sfnt_off0000cbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE8 16228 bytes
SHA-256: 8cda59426010f0918ab839109b9a9ac01419f6f762477cff0f3f1bace0352d23
font_02_sfnt_off0000f513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF513 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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