Malicious PDF — malware analysis report

Static analysis result for SHA-256 54571f2279bc96ef…

MALICIOUS

PDF

88.2 KB Created: 2021-09-23 19:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6d10b8d718ea474614e2e778c3f64801 SHA-1: 4d61d104810b069f8e1b2914c5ee921ebd5f9477 SHA-256: 54571f2279bc96efea56280a6f6a6c814caff39be77a44d7e44ffd81311f1488
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs that point to compromised CMS upload directories and disposable domains, characteristic of link farms used to distribute phishing content or malware. The presence of these links suggests the document is intended to lure users to malicious sites, likely as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://archism.ru/uplcv?utm_term=cheat+apps+apk PDF link annotation
    • https://frigosztufi.ro/ckfinder/userfiles/files/25892152840.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/nopubesipi.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/rexakujizigaralis.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/0d42185c1b9b95aa00dae5090559687a/54000909616.pdfIn PDF document text
    • https://otterdisplay.com/userfiles/file/97509618805.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a10fac989e---zaxenavogatexudowaguw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/s8ibv3213o11gi5706coo8bpr6/lubatikedojesuxude.pdfIn PDF document text
    • https://superchills.com/userfiles/file/36181607835.pdfIn PDF document text
    • http://fmdscu.net/userfiles/file/lujifuparirabenusosejad.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210920025532.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/nezika.pdfIn PDF document text
    • http://polipack.ru/content/file/wafaxajetumabepam.pdfIn PDF document text
    • https://giltmorestukko.hu/ckfinder/userfiles/files/66689389191.pdfIn PDF document text
    • https://hung168.tw/UserFiles/files/zuwibufigazesarafototef.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/tofawevonapuxarop.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/16358818434.pdfIn PDF document text
    • http://rococosofa.com/files/files/mebupewikejikujeremilufa.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/tafojatasitejabegogupe.pdfIn PDF document text
    • https://ckv-siemreap.org/ckfinder/userfiles/files/sopumoze.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210924_476E30FB39DEE008.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/wadorogujowasawuro.pdfIn PDF document text
    • https://kueapem.com/contents/files/30742924629.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/legedajediligonugasobizaf.pdfIn PDF document text
    • http://logicamail.it/draft/media/domudezozefolofuvema.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_off0000f599.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 18288 bytes
SHA-256: 4499492bfb01160ebc225c13b608dd8f6c2d61d86fe099ba6022e6d02fd4099b
font_01_sfnt_off00012501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12501 10012 bytes
SHA-256: ff7b8b9c7621219f37ec89d1135e00f39de364fe2b7e75692e6d195225a6624a
font_02_sfnt_off00013b70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B70 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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