Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bc211b72bc0536…

MALICIOUS

PDF

85.8 KB Created: 2021-08-31 09:55:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3941b0486649d7223837dd8301067f99 SHA-1: 4805f39c3e408751700183c3b3249fc2b9e94134 SHA-256: 44bc211b72bc05360ce24968acc6dc259130db2f74d4b01cbbc9eae865007596
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://talaa-obour.com/webmisr/uploadwebmisr/file/demimulovavafatusejara.pdf
    • http://wienbildarchiv.com/upload_files/files/98655361959.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160750ec773a15---kusizabidiferikonojutuvo.pdf
    • http://kartelabasligi.com/images_upload/files/sawiveliborevuzafab.pdf
    • https://rosycaffe.com/file/50680905680.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/16098447d73013---26650316873.pdf
    • http://ciccioinpentola.com/userfiles/files/28265632132.pdf
    • https://facades-metal.ch/ckfinder/userfiles/files/58504110728.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/78673580715.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16093f430cbfc9---49189693902.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8efed090d0---jevutiwezatemoreguxe.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4b0bc7bd6---3732939597.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/88747d4c262004c160783e5dbb21f55e/lexamamidodi.pdf
    • https://asztromiskolc.hu/ckfinder/userfiles/files/vagukifesirekogajadez.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160725de0e62f9---tetawekimugolalisavit.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bde32c2639---76072082639.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e3f1b7adfa---25185385412.pdf
    • https://chmelo.hu/sites/default/files/file/39255567481.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080389e77c97---79193600142.pdf
    • http://www.oneworldkarate.com/fckeditorimages/userfiles/file/9434377061.pdf
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d606c3a82a---nodunedutufus.pdf
    • http://mcenterdk.ru/fck_editor_files/files/misezupori.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607086ebbc799---99514199125.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8mf3em6o6gdogqgce8s28fkhcp/tuzuninu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=fayette+state+park
    • 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_off0000ec2a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2A 16792 bytes
font_01_sfnt_off00010441.bin
dea0027e4565aaa17a38a598de3dcc7d24a4bacb1b401d5babdce1b93feb0d1d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10441 10064 bytes
font_02_sfnt_off00011adb.bin
61fbbb8f66250e9af05ac4a8cef4f8e6bf6e241e61ccc3b7ca42bc0e997839ac
pdf-font-stream PDF embedded font (sfnt) at offset 0x11ADB 18124 bytes