Malicious PDF — malware analysis report

Static analysis result for SHA-256 3deefbfa677be1c5…

MALICIOUS

PDF

81.7 KB Created: 2021-09-11 19:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: dfb461f70f9aee001fd30985a9c77cd6 SHA-1: c8d14cfdd7d5acf75ae44c1e58ec3e9e7801665c SHA-256: 3deefbfa677be1c54ebe8386e8678d46c439f2d0d4e9d8332dcd033ee93c908d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a significant number of embedded URLs, many of which are structured as link farms on disposable hosting. Heuristics indicate these links are likely used to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://allytemp.ru/uplcv?utm_term=real+top+followers+apk PDF link annotation
    • http://bjsddesign.com/filespath/files/20210905010756.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137fd726ccb7---pivotarosipesa.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/rokafubazoxevaj.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/019c2ef377764006f7ab86ab1b67e9cc/29166483499.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/94396707430.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/2846311724.pdfIn PDF document text
    • http://badgerhillfarm.uk/kumim.pdfIn PDF document text
    • https://kolorubursztynu.kolorubursztynu.pl/web/uploads/files/49973802868.pdfIn PDF document text
    • http://cpils.com/userfiles/file/zamorunufegar.pdfIn PDF document text
    • http://orthodoxnews.us/file/gumadutiv.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/kozodegexiburitaramagoba.pdfIn PDF document text
    • https://matrixx.lu/images/lokevigatitu.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/nanabosuro.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/96476649313.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/21919427703.pdfIn PDF document text
    • http://studiodugnani.it/userfiles/files/vufiralexajo.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/sedan.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/59738101703.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133ea1bc0f4f---26420517955.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/xekirijakopenaxusalemose.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/25426910587.pdfIn PDF document text
    • http://shopphutungmayphat.com/upload/img/files/sugej.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_off0000dd70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD70 17080 bytes
SHA-256: 7fe80cf5f87760a5f8b975249426da40bc1c0e550814dc9d042715dc89d26dd1
font_01_sfnt_off000109ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AD 10380 bytes
SHA-256: 1509e9e1b628fa80531ad041541fdadbec4d54138997f1455dca7b9601608715
font_02_sfnt_off00012170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1