Malicious PDF — malware analysis report

Static analysis result for SHA-256 c058a6914e0f43d8…

MALICIOUS

PDF

99.0 KB Created: 2021-09-19 00:26:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c826882e04a4e963684949523407676 SHA-1: b153fc7c9de11a85c6b9ea1ee0985915a32753bb SHA-256: c058a6914e0f43d838635a33a166212113c74e4e83d47e68e610d5a9afa3b7d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and links to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. The presence of multiple link farms and the use of compromised infrastructure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://inwebjor.ru/uplcv?utm_term=use+old+phone+as+gps+no+sim PDF link annotation
    • https://ecpa.fr/uploaded/file/69067952644.pdfIn PDF document text
    • http://telecycling.info/files/file/33846259857.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/66689661200.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021992132207575.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/37944570435.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/zokozamejewepotegox.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e18185b29---2889394581.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/24879787755.pdfIn PDF document text
    • http://e3edu.vn/public/ckfinder/core/connector/php/connector.phppublic/uploadsfiles/fabupej.pdfIn PDF document text
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/xovafanunizobudobu.pdfIn PDF document text
    • https://seo-methodes.com/userfiles/file/84613812497.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/10316989768.pdfIn PDF document text
    • https://ismart99.net/upload/files/zosenelikev.pdfIn PDF document text
    • https://nada70.org/userfiles/file/mowepizemidavoxisogeri.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365c9143ccf---10066018874.pdfIn PDF document text
    • http://trivio.it/userfiles/files/mezigi.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/59326277000.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1c3f09188---daborodetu.pdfIn PDF document text
    • https://www.liftechforklifts.com.au/application/third_party/ckfinder/userfiles/files/33101739562.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109051608069697.pdfIn PDF document text
    • http://studiolauramoschini.it/userfiles/files/34717804578.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/jevofafevuta.pdfIn PDF document text
    • http://szigmetal.hu/editor_up/670739452.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_off0001198d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198D 10648 bytes
SHA-256: 1b505d13ce59ebcc37fc2794b669765805dc947a4d95bf9ef2be2e04724290d0
font_01_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 19960 bytes
SHA-256: 3c0b240ec34f7b8017d6f167090855312364a0c7032fe9570a0d556092c411e1
font_02_sfnt_off00016688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1