Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27a91cceed8e91a…

MALICIOUS

PDF

82.5 KB Created: 2021-07-02 18:03:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42751e85416fa23a335706b7093e9e2a SHA-1: c8adbaa4e08855d12221e6e61374baa966185208 SHA-256: f27a91cceed8e91afc55d3354110f5d6f1903a291ad20557695b72548b702bba
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to compromised WordPress upload directories and other disposable hosting, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of these links and the overall structure strongly suggest an attempt to lure users to external, untrusted sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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 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://smidgel.ru/uplcv?utm_term=cheap+bedsitters+in+diani
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608107bedd310---momasimuligose.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16080061639944---rujokovedexavevijozagofol.pdf
    • http://diplomat2014.ru/ckfinder/userfiles/files/nudedowumefaru.pdf
    • https://ngoctraithaibinhduong.com/uploads/news_file/87491093469.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/38a923ea478e74be8e7126e8f555c1e3/wesekugubajuvig.pdf
    • http://andlupa.com/userfiles/file/39435493968.pdf
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/xetitobaruxevedazusutunas.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a41795050bf24abec72507fadc3e7f5c/korafinawosavagozifog.pdf
    • http://k-yoga.org/file_upload/spaw_upload/file/20210615210517.pdf
    • http://school19-zav.ru/userfiles/file/digudezere.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/b01074f3f0024ede2b26fb62a7518b1d/49172332048.pdf
    • http://alkanboya.com/files/file///nekumesepatedexasepiwug.pdf
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0c9b85c4---patakonagulutovag.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8313b201a---338250681.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609403a483f4b---74818887409.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160b6878e9652b---zuvitulupadapa.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/1cf76726203cc85c8e90f5322a9e104e/56604632109.pdf
    • http://mabifitness.it/userfiles/files/vonamorajoraf.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c198d5ec120---similukaravo.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/vivopitefabi.pdf
    • http://daoltrading.com/userData/board/file/15580966614.pdf
    • http://talani.nl/userfiles/image/file/riponejurevudenanema.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077396a8a859---79002729090.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e170.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 16792 bytes
font_01_sfnt_off0000f982.bin
7cdaab82a41c3712d104c3954dd033b0f839fca8cf5e7fa70349567b7e97ac23
pdf-font-stream PDF embedded font (sfnt) at offset 0xF982 16948 bytes
font_02_sfnt_off00012532.bin
bc4e8388596fde97dc988243f88f762f1b1741079d9e1678a04f3ed6aca816fa
pdf-font-stream PDF embedded font (sfnt) at offset 0x12532 10496 bytes