Malicious PDF — malware analysis report

Static analysis result for SHA-256 22fda49f2b3b4d48…

MALICIOUS

PDF

49.8 KB Created: 2021-09-28 05:32:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 653b89211a9926c1ece4e8195a24d439 SHA-1: 384d62d518d9e0629af4848faaa2db6af93a8f60 SHA-256: 22fda49f2b3b4d487c2437a69e432a247153f8bf2a4e291c306c9d1b403b2ceb
154 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs. Many of these URLs are hosted on compromised websites or disposable domains, suggesting an intent to lure users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9068

Heuristics 5

  • 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
  • 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://huntic.ru/uplcv?utm_term=pdf+to+excel+free+online+instant+converter PDF link annotation
    • http://daehwa.info/uploaded/file/971660539.pdfIn PDF document text
    • https://papiratisk.cz/soubory/79797405138.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16145cb22f32bc---birugotatuverefu.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/36102575582.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/83811813983.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/65766159474.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/gevigawujerenuwuvodomobir.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/88823172147.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/5390150282.pdfIn PDF document text
    • https://www.creativetalentnetwork.com/ckfinder/userfiles/files/60727091592.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/valogivebuzazimivafu.pdfIn PDF document text
    • http://mrybalko.ru/files/fevazamezogatosaxefajov.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/50157208391.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/20f61351dadfc9ef2fc4d0cbf2057671/56647719131.pdfIn PDF document text
    • https://cebubigsellers.com/userfiles/file/xaloxewosinubaweja.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/19913409949.pdfIn PDF document text
    • http://mega.kz/media/upload/files/pemosawepizesu.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16130f76cdc475---welepukagugiremuravokeni.pdfIn PDF document text
    • https://myagenda.myagenda.cz/pictures/editor/files/74097243181.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/merigolixolanutamexefiko.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/84774793944.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/3p9ta0kel36v0uhkpi5f17qno5/85761341059.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E4 10636 bytes
SHA-256: 923b868680a74d0144fa99e98a99bf50afb0b46633350291f8bf4e8880199b5a

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