Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7317823fa9c385e…

MALICIOUS

PDF

69.9 KB Created: 2021-09-16 15:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b4d0b1861e133df3e94f9740ba682657 SHA-1: 98c11d2780eaa0b734e9b9dc9be42c3e0af4a6e8 SHA-256: a7317823fa9c385ef40899e09845a959ef84af9b14be34cbc2fb8ab711d31d33
176 Risk Score

Malware Insights

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

The PDF file exhibits characteristics of a phishing lure, including being image-heavy with minimal text and containing numerous external links. The presence of multiple links pointing to compromised CMS uploads and disposable hosting suggests an attempt to redirect users to malicious content. ClamAV and ML classifiers also flagged this file as malicious, reinforcing the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://gadkowski.pl/repository/filemanager/file/91435276596.pdf In PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/padelinolizedot.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/sirit.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/vipefesobekadut.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/18150444452.pdfIn PDF document text
    • http://henghuitong.com/jingkelun/userfiles/files/20210915194735.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/7a24ec0e4fdfd57ff5c942b403c12a31/susujevekipol.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/4211055008.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/4f80b345a21ec942ba9b43e55484179d/65643391937.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/95735554402.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/37776863046.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/venunuzoleje.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/gepeja.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/35352348817.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/61fe69a53b6df250da68f5e1826ba017/79607615881.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/dajazulitibal.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1e00b55d2---zejibeju.pdfIn PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/12980688862.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/f756643e3044ea30a327393b450ad30e/31913705774.pdfIn PDF document text
    • https://equimat-cheval.fr/file/9015217310.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/kenurep.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/79858749466.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/53987302303.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/24651984098.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/908033327.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=download+dsploit+apk+for+androidPDF 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_off0000b565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB565 14416 bytes
SHA-256: 64579e628287e67f3d813193aec08f7a597f16fb6e146a18916ad828258ee60a
font_01_sfnt_off0000d91c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF133 10540 bytes
SHA-256: e63de8833a8d4b07987159260107a579746e829334b0732050ef67614c26600e