Malicious PDF — malware analysis report

Static analysis result for SHA-256 13dc47f42d443759…

MALICIOUS

PDF

86.5 KB Created: 2021-09-18 07:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8e702589df7d167ecb7ff1a275fa7610 SHA-1: aaacb669252a601026dac32728ce161d350a798e SHA-256: 13dc47f42d4437590e56973f029b02e1c17415e5b8a1cd53506ac327d573a5bb
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. The 'SE_CLICKFIX' heuristic indicates it's a social engineering attack designed to trick users into running commands, likely to download and execute a second-stage payload. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://crysiq.ru/uplcv?utm_term=pc+stuck+in+recovery+mode PDF link annotation
    • https://www.thaiahpa.com/flash/files/82737333715.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/68110892321.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/zabobigov.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/bifawulobodarubujoma.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/fofemikefajedawomafu.pdfIn PDF document text
    • http://aquatherm-graz.at/files/bedoj.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/zasomunezivejarobexaz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee093e2ef6---69607950230.pdfIn PDF document text
    • http://zerosquareonline.com/file/xafolulodomodadi.pdfIn PDF document text
    • http://vuason.vn/upload/files/76552568609.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141854d01e97---towugefik.pdfIn PDF document text
    • https://bharatceramics.in/ckfinder/userfiles/files/lisizafobi.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/61469152965.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/99799084743.pdfIn PDF document text
    • http://lovesenergy.nl/file/16155483074.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/wumenasub.pdfIn PDF document text
    • https://hirurgija.me/files/zizukebinekipomoxosex.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/79561497864.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613750f6b774e---93367720448.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ovr08j4i1k4pg8ndjtueuhtbv4/21899779644.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/33050382342.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/19b37a.pdfIn PDF document text
    • https://limsurdua.com/contents/files/bobovuwogisitaravog.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_off0000eb82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 18676 bytes
SHA-256: 430e6812a22fc87aba1df3fc66a6faef2291e2d5164cc7c3520e412b1f7ed997
font_02_sfnt_off000133f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133F2 10696 bytes
SHA-256: 14c68e5c79c41758dc7975f71d54c2ce7013304eeb2b87e69f042931ae470648

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