Malicious PDF — malware analysis report

Static analysis result for SHA-256 adf83c87b1f2e331…

MALICIOUS

PDF

88.5 KB Created: 2021-06-26 01:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: e5821367a885831ef389fc49e63c47a6 SHA-1: b8a9c03cd7813faf3565ec6f7673ffa13a403efc SHA-256: adf83c87b1f2e331fb911dcba27ef0062c496eb751f9235e26fccb43e99b1776
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. While no scripts were directly extracted, the nature of the link farm suggests an intent to redirect users to malicious sites, potentially for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://argentum.com/wp-content/plugins/super-forms/uploads/php/files/qv75lu6ltgcji51rodcibpq2qu/88540855214.pdf In PDF document text
    • http://bidmitt.com/img/files/file/nodubitudupimojekadurozud.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160798d92e7470---ririraworer.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qkttq15ae0ti84lota2er4d3kp/88535018493.pdfIn PDF document text
    • https://everestart.com/images/stories/file/96580804862.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/48528649589.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/33094001611.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/wufaxikerezuxow.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3656615a8---64226863582.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a1ed1ebfd---83636262486.pdfIn PDF document text
    • http://fitviewer.biz/files/file/89199066861.pdfIn PDF document text
    • http://aitrans.cn/UploadFile/file/F1202106192222556881.pdfIn PDF document text
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8c02d6f39---1755357733.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/wavapedabakigamisobuji.pdfIn PDF document text
    • http://biblioteka-belzec.pl/upload/files/596586709.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/24023043886.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/01815bcc6088fde5ee46be24733b014a/doxeduwagutugojuvavuvi.pdfIn PDF document text
    • https://xn--arbeitskndigungsrecht-best-5zc.de/userfiles/file/telolizavodewarigu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/r1k2o3cjc16pjm4vaq1mbti7a2/38477173891.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/81419322714.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160848889aff90---javupogomimazurobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=meaning+of+oxidisedPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAC 19176 bytes
SHA-256: a0cc4b8d80ff68b49b19f91116e98e60e78655afeb7d35e101743dbdefcabfe1
font_01_sfnt_off0001101b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101B 10380 bytes
SHA-256: 5b2ce0f03e80b76f94833394c2548b74950cf4da54d90e92dcc1239d5266b394
font_02_sfnt_off00012781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12781 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00013f92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F92 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825

Open this report in the interactive analyzer, or submit your own file for analysis.