Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b44bb8dc708152…

MALICIOUS

PDF

69.0 KB Created: 2021-10-04 01:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9c97a9abf35ff2af17d0b778f75c84f3 SHA-1: 9961b55f6d3b306e466ab232ff5cbee512a53058 SHA-256: b6b44bb8dc708152b0502d8f186c90d78c87ddf19e640d162a5831337b3494cd
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF employs an image-only lure, a common tactic to disguise malicious links. Numerous embedded URLs point to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download and execution of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://coretry.ru/uplcv?utm_term=gravitational+force+is+conservative PDF link annotation
    • http://inlovehuahin.com/file_media/file_image/file/wozunosekobisuzemaluparad.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/82262175430.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/e25cd5357535678a764521dc897114a8/repizin.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/a5imu936hs6v3hsofm8c2tnohe/zopemigijuvi.pdfIn PDF document text
    • http://abwessex.com/uploads/files/39015844906.pdfIn PDF document text
    • https://nistd.in/userfiles/file/damenidiwabatekikasu.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/60089543440.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df25481263---rofipu.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145362ce893a---33899120268.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210919150923.pdfIn PDF document text
    • http://kraski-chernila.ru/resources/file/nitoxiwijutegu.pdfIn PDF document text
    • http://szjwwj.com/userfiles/file///wukumelubobigixororuwiv.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/zotepolazisumu.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ffbf00703d---pirurilelakavevukifuwuka.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/gedoxikenuwudap.pdfIn PDF document text
    • https://fond.ru/userfiles/file/95667618586.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/vevuruvowukozisamikuli.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/42543163243.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/4888577405.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/05b6497453550915ef9d976b88a87e73/gamujasodizof.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/78322116924.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/pobuzirekorezemuviz.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_off0000b264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB264 14332 bytes
SHA-256: e68ea0aea1271c53a0681663d744debe55bd766ea16d7f554828222bde0e07e0
font_01_sfnt_off0000d654.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD654 10432 bytes
SHA-256: 64220df913c96c0cc67b085a84cd77d901472c728139bac05ec3f4d3976663ce
font_02_sfnt_off0000ee2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1