Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd043144d5bdb083…

MALICIOUS

PDF

83.5 KB Created: 2021-09-02 01:48:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 699d4365e6e9d0175ca5fd3ee5816272 SHA-1: 87d5523a5df6b4b24b7fcaf0f8d96f0fa86def43 SHA-256: dd043144d5bdb08373001b229303f618d9f7d0b3f892382985a99722d9e4d5f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, forming a link farm likely designed to distribute further malicious content or lead to phishing sites. No scripts were extracted, but the structure and URL patterns strongly suggest a phishing or redirection campaign.

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 http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160a507ff53a1a---74760384477.pdf In PDF document text
    • http://alfavit.tv/userfiles/file/34459840087.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/47025494841.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/367a54650cb099034b40146d165d1bce/54224041550.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/rolepawodapeg.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/19023551806.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/vawiw.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161055490627cc---70889137463.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/145ce02ee7c2a419b28eaf53771c751f/70236121606.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/wuwanezufewex.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/171788424608f225ee0aa4.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/77345712081.pdfIn PDF document text
    • https://fl-forever.com/upfiles/editor/files/34147083967.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3d4b8f97---86107574089.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4269c8f037---jetojizetuvawekulu.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/84558201505.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/48252311402.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/rolomamojamovuleroxa.pdfIn PDF document text
    • https://ifbscalidad.eus/files/galeria/files/fexuwukugepegajizuvag.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/61241154420.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ada062c46f---budigabel.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a83d198efbd082c813695c3d7b92b627/86806333133.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/79502803071.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/8218212090.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/92987c5f1ebb5c4eda57202ddaa59016/nofuwedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=are+snakes+color+blindPDF 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_off0000e307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE307 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1E 10476 bytes
SHA-256: 4cd8dc295ad9ecfe6fa01e6edb12b26923405e3b4892f9cd3a3384c82b46e835
font_02_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 17504 bytes
SHA-256: 23ceca514bd75384c7e5f0acc045e4625ec0785f0be2598dc10744a9b12655ef