Malicious PDF — malware analysis report

Static analysis result for SHA-256 4afabb86afae8ca1…

MALICIOUS

PDF

68.5 KB Created: 2021-09-07 05:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d18f262f4d70d7cb632d642fee1e86ff SHA-1: 89ff17f98085596dae7425e6e06a38460bead515 SHA-256: 4afabb86afae8ca14d6c82e5a303746c15383dbbaf1024baa3e99ad14b2e5cfe
176 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a phishing lure, utilizing an image-based design with clickable links. Multiple heuristics indicate it's part of a link farm hosted on compromised CMS uploads, aiming to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for distributing further malware or conducting phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 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://marwaautorepair.com/nbloom/fckuploads/file/94732339771.pdf In PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9ba9b70c91127236ae27aee6e9c03a02/pifimikazodomixij.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/pujagego.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/cbb693ca0cb719f8e598ad14b9fb8c7e/fozovireg.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202108151335499182.pdfIn PDF document text
    • http://sistersaviopublicschool.com/userfiles/file/rifopixobaxixarewe.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160872ae5048e4---71605919020.pdfIn PDF document text
    • http://orthodoxnews.us/file/65979703796.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a823877edf2---xedurov.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210518210841274976790.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2869b0282---45536610820.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/jezafa.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/wosiro.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/d85ed5e6c7dce63fc4298971fdf3cdc7/77910197117.pdfIn PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/16955040175.pdfIn PDF document text
    • http://expnavi.com/sites/all/sites/default/files/file/petobepinuxajorizul.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160792d6cd1182---wekoxifugurudexeko.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/73124355111.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1625570980.pdfIn PDF document text
    • http://creative-format.com/upload/editor/files/21807091835.pdfIn PDF document text
    • http://dawahcity.com/userfiles/file/zifadetuvog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=urine+biochemical+test+pdfPDF link annotation
    • 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_off0000b079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC890 11032 bytes
SHA-256: 82fb7a822dc34cb1d9d65a03f483552411ba629c9714bf3c78408609fb8324ab
font_02_sfnt_off0000e1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C7 14068 bytes
SHA-256: c2aaba6edc96c13a4e40b0ec888a9e0d181c99da5726a84124ec6bb0a77393ed