Malicious PDF — malware analysis report

Static analysis result for SHA-256 e745f12ffcfa7360…

MALICIOUS

PDF

100.2 KB Created: 2021-09-21 07:32:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9c5afd402f5648ea1cdcbd315da2cbec SHA-1: af7202831b71e6b42dd99f2def7d748072eeac06 SHA-256: e745f12ffcfa736073dd02502014689e2a08948bb397473af3c1b6effd9890f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress uploads, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9784

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 http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161389db91996e---87987974087.pdf In PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/57150085895.pdfIn PDF document text
    • http://htygroup.com/upload/files/26388713235.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/vt60sn3na7mtclomt4avm775pi/rujejoribupafaxowefevobun.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/7577439474.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/95458816474.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/waliweri.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/36490698521.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210911190205.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/dituxif.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/jabuboworakifewibitej.pdfIn PDF document text
    • https://tele-video.ru/upload/files/wirefupupunonotizupezef.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/55591252899.pdfIn PDF document text
    • https://bruceleevideos.org/images/file/29064084897.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/tokibisopidex.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-18/20210918041502358629.pdfIn PDF document text
    • http://machulski.com/public/file/wanaxaxosemiraxopedeke.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/25121253990.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109140355326435.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/woretexalinarasomagul.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/16727776.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/70718187368.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/c842a190ba293396187f2dd37b41709f/85471395692.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/fefuxovefidivutidikugo.pdfIn PDF document text
    • https://khanikango.in/file/17513947153.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9d844d194---66038369837.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/nobibeduzemoxovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=legend+of+korra+s1+ep1PDF 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_off0001234d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1234D 18404 bytes
SHA-256: 43142fe54b24981cc511b27d936c60e16be8e842b41d4e8dd90a716cfb97082a
font_01_sfnt_off00015343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15343 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B5A 10536 bytes
SHA-256: 929f5f1e09d03d246d2a7156060ab6bcb16142c3cb8a8eb086152eb5ad61917d

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