Malicious PDF — malware analysis report

Static analysis result for SHA-256 33375f84ae10d1c0…

MALICIOUS

PDF

67.6 KB Created: 2021-08-31 03:37:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07472962b655f3a4464ccfe42d5d2103 SHA-1: fffb44d5d9ece9503f24bc8ba1575a2f2e4204a3 SHA-256: 33375f84ae10d1c042f16b753a5a7a815d5c594c5e5c79f51174dcdb8d42f569
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains a single image and minimal text, suggesting it's designed to trick users into clicking an embedded link. The numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, indicate a link farm likely used to redirect victims to malicious sites or download further payloads. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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 67 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://smidgel.ru/uplcv?utm_term=best+high+school+in+tracy+ca
    • https://pet-fashion.ro/mm/file/fifafa.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/mukuzebemo.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16071391e1d28b---jotetamiguridelugut.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/8205fe52725d2cc386efe5836366b4bb/zunisebapuvizeximidokup.pdf
    • http://parzenica-bialka.pl/userfiles/files/4281506108.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/56e94c35d669bd79dd8ea56c1241c16f/49157429498.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16129bb2e205bd---tuzivenogo.pdf
    • http://www.florentmaussion.net/userfiles/File/tezotuvafemewopaduzapijub.pdf
    • https://eksiliotomotiv.com/upload/ckfinder/files/28243135032.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/21587845729.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/t5sn8tfrdvcpn0kmed1sa9a1d6/lovixisakusofofi.pdf
    • http://dobrejaja.com/Upload/file/puzadugapazutum.pdf
    • http://fcraregistration.com/UploadedData/file/xiwokofowiz.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a3d8d506d3ab6b0363ef0b1ed21e7c7d/65519359518.pdf
    • https://henklinders.nl/henklinders/upload/files/8081032450.pdf
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/0dc528fcc1f10759d73380b847be49ea/49553526694.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4e25045c9---gugawu.pdf
    • http://www.oiseaubleu-promo.fr/userfiles/file/tolexikimojexekawopeki.pdf
    • http://nelly-design.ru/upload/files/pajoludozivazovewewez.pdf
    • http://kolasinprevoz.rs/slike/files/42672379810.pdf
    • http://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/popikufedutonik.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/su43g2ae7v7dnkq4ip4e0ig9f9/rorujoximamizizutumolipe.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_off0000ae06.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAE06 16792 bytes
font_01_sfnt_off0000c61d.bin
84abe5335432ec85277f2413f9b64d7b2676a868e62d1efe2a8c644843fde95f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC61D 10676 bytes
font_02_sfnt_off0000de99.bin
3cfe3c406c4c184a5dd83b2dcd6ec2c6bbcd32cffdeb5ab3367695ab39350bda
pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 14092 bytes