Malicious PDF — malware analysis report

Static analysis result for SHA-256 b429cbe036131aec…

MALICIOUS

PDF

90.5 KB Created: 2021-07-06 22:46:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8b6d766ffc59438285163b0ed66ba764 SHA-1: f7074a6971012cd5479bfff16766061ea06e89f1 SHA-256: b429cbe036131aec62876d7ac1dde93c5d030b522939ed4691709b9bcef66e43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the presence of external URIs and compromised CMS upload links indicates a high likelihood of malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://medvor.ru/uplcv?utm_term=what+happens+after+you+cum
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/f0643abac5482111aefe6b51b40e0cf6/75616358008.pdf
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609df08c19e34---fukoxiretulivusezovu.pdf
    • https://ascinfratech.com/clientprojects/trading/file/tufisedijamepike.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210620062125.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8da2336870f45cff27cd80c8be18a219/fixifirukikamotuwepaja.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0eb7bac828---41587080334.pdf
    • https://mimpiindah2.com/contents//files/2324462387.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7d9ea6ba87ed1f999655adc2bf1dbfe2/dawesilogasedegos.pdf
    • http://teplolux72.ru/upload/file/45348853673.pdf
    • http://kartelabasligi.com/images_upload/files/linepokesexixiwivi.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abed5c892cf---nasunuga.pdf
    • https://fotoprint.lv/downloads/file/givifakazoribevikumo.pdf
    • http://phillipsbricksalumni.com/clients/56168/File/47455598185.pdf
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/wufab.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/a11725022de8faab5fe8747947b7ee70/60148803444.pdf
    • https://tolgyesvolgy.hu/userfiles/file/detexafumimozoxoxokuw.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8a78f19f---rusatupeririwu.pdf
    • http://ajivikafinance.com/userfiles/file/pibagonumowareru.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868017ccb3c---17520689244.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9cf646a811---xotedafoxezuduvojid.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/3ee9ca32e87444eb57c1393a42180b55/79966518652.pdf
    • https://akproauto.com/nbloom/fckuploads/file/83553989449.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/1464f469f6352bfcceda31a5808c24a4/renev.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_off0000fe9f.bin
c6dac42a0183544ad2e3f6f42187de255b35f5f3b57392d72dbea2abb0d5fc0b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 16884 bytes
font_01_sfnt_off00012a53.bin
ce555ca7d7f11ff708ed5fbfca043b87e01eb904dcae79246d1938901cb229ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A53 10812 bytes
font_02_sfnt_off00014332.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14332 16792 bytes