Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d6446cdabad080a…

MALICIOUS

PDF

74.4 KB Created: 2021-09-23 02:56:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 73724f85ca31506ce6738f6b06885c36 SHA-1: 0938e84506eac9bd65ea7d222a5056e0db74a2dc SHA-256: 1d6446cdabad080af7d6e2486e557587d8aeaddc02c51b8081b4a2c849e2661a
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Numerous heuristics point to the document functioning as a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting. The presence of `utm_term` parameters in some URLs suggests an attempt to track user engagement with phishing or scam content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://irlanc.ru/uplcv?utm_term=how+to+run+a+apk+file+on+pc PDF link annotation
    • https://bibonatura.com/ckfinder/userfiles/files/zuzopedoxok.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161312b78bb091---42393614012.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210914080208.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613068e6ab628---33613377583.pdfIn PDF document text
    • https://olterus.org/contents/files/83702136037.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/78776736976.pdfIn PDF document text
    • http://zatacorp.com/upload/files/pupugufokosilobuzij.pdfIn PDF document text
    • https://oriental-kitchens.com/userfiles/files/babinuvovaliza.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/16411171201.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/97688017570.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/redej.pdfIn PDF document text
    • https://empresa-venta.hr/files/4701864038.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/95164269148.pdfIn PDF document text
    • http://silarperu.com/UserFiles/file/17784861339.pdfIn PDF document text
    • http://mebizstekla.ru/userfiles/file/80274999016.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/pituzevuletuf.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109071535103839.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/57219502445.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/bebizojekatatevelam.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/70635653072.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/poxidutadilutaripo.pdfIn PDF document text
    • http://baovecongtruong.com/upload/files/61562733653.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/07dcba48a37b1bca6447f4644de9a7a7/xajatafezul.pdfIn PDF document text
    • http://houtackers.nl/userfiles/file/dazatizemur.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_off0000bf5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d76d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD76D 17172 bytes
SHA-256: 2e1546c2a6fec6d4b56f3e6e5636dbef61bca03df3ed4987d29cae386e05e823
font_02_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 10572 bytes
SHA-256: 753b8e758bf235d8408fee335a57fd83b40af7f4dcfdeaf6e4981fc2a7820964