Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc6702178ba183d…

MALICIOUS

PDF

68.9 KB Created: 2021-09-30 20:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c8d4878e8fbbb48697913d4b1fa234d1 SHA-1: 3f8051058ecef2285e0079339f8e70cc569534c0 SHA-256: 8fc6702178ba183d40c01795bb6335c81fdec44d437e182522f106adb0045ae4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and the ML classifier also indicated maliciousness. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and link farm indicators strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=how+to+reboot+moto+one+power PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143b6b1df2c4---ravenedevu.pdfIn PDF document text
    • http://exosushi.com/uploads/files/juzigi.pdfIn PDF document text
    • https://tiemhoamo.com/data/dulieu/files/woripuvem.pdfIn PDF document text
    • http://klaaswester.nl/img/file/19090972265.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/21938440403.pdfIn PDF document text
    • http://esistore.com/userfiles/file/sokafosubenujegoju.pdfIn PDF document text
    • https://marlschuz.com/userfiles/files/82947878931.pdfIn PDF document text
    • https://ekransamara.ru/files/kofede.pdfIn PDF document text
    • http://civicwomen.com/ckfiles/files/vavinamamawipokezovofusik.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b3391edb7---mogudoxajotufujubudukum.pdfIn PDF document text
    • http://psychologyforeverybody.com/ckfinder/userfiles/files/fekisokenamofameforegug.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/33194471166.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/fec82dc145c01496c5d005bd61ec4b11/kajaduge.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/38138979141.pdfIn PDF document text
    • http://baltic-rt.ru/ckfinder/userfiles/files/vutelafabaweneneriredapun.pdfIn PDF document text
    • https://www.mmgrowersg.com/ckfinder/userfiles/files/furimadulufaw.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/kixodetuj.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/42328884385.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/dumabapun.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/27889964308.pdfIn PDF document text
    • http://starcity-vinhomes.vn/app/webroot/img/files/votaxapirolulugofejifa.pdfIn PDF document text
    • http://addon-colsman.somantec.net/ckfinder/userfiles/files/rezufoxakebu.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/2040291521.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_off0000b10e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB10E 10164 bytes
SHA-256: 4fb9b98328a6654b8f9466d5587c6981925c61b7020b2d07b9e844011a6ebae4
font_01_sfnt_off0000c786.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC786 15260 bytes
SHA-256: 72e0df876d1f7741f9e792c7648d7546c0579fe0d8cbd695d9bf88303b953033
font_02_sfnt_off0000edc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1