Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ba81e9870b876ad…

MALICIOUS

PDF

72.3 KB Created: 2021-09-06 12:33:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b7d63132efabd306f415a5f24f0df32a SHA-1: 67a58e1bde19a8b78b7ff2c330d7b53337c120c8 SHA-256: 7ba81e9870b876ad1c6b1a0c705b97f52087e2c63ff98801d2b53f32e4f3cb39
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to a compromised WordPress site, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of a link farm on a compromised CMS upload storage is a common tactic for distributing malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/fj1peo2qmu1fopn9hclqi21cg7/dewawebijawowodogojib.pdf In PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/xobunediluvavoxuzu.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/96038925831.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdead68054---81541742914.pdfIn PDF document text
    • http://pointwebhost.com/calisma2/files/uploads/99087942577.pdfIn PDF document text
    • http://josephpowellfamilyreunion.com/clients/0/04/04c15d356d3082020e114f8c0300f46e/File/77407824250.pdfIn PDF document text
    • http://morecoredesign.com/images/imageUps/files/borif.pdfIn PDF document text
    • https://auto-rujo.com/images-editor/file/57001845023.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/9654373578.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/wagokepumun.pdfIn PDF document text
    • http://luluscafeonline.com/uploads/files/24822879354.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/firuxofurazobujuxomugubom.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/dd2c7a46056e1a645c24a49588d5c65a/39886956361.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/908vrnirte5btd1s3ikgj5p9j6/28701570353.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/68742704265.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tedafifokuzana.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/ratomoxutipuxojowemawaf.pdfIn PDF document text
    • http://melvin.cz/data/kefawezosumufuxap.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/tigogeg.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/5aeb4aaebd9d49e04262b548f30ba565/xeloduperuxifexok.pdfIn PDF document text
    • http://schubert-hh.de/image/file/fegebixikileb.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e679cfc900b---xodig.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/89168491246.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/vumufojijifopekasufaxu.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/daredodapif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=kaedah+kuantitatif+pdfPDF 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_off0000ba81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 16232 bytes
SHA-256: 965d48b18cfe8c98c9081d1bca7ffe9eb2e11222d42b83367259992eb6438e95
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 10344 bytes
SHA-256: eb1cb3934399ff88a337772dc9e80387e9079dc05e00cc932648ab9e8d9f33e8