Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcdfe8932615bb4f…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 12:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 2195a37b77b5b57ad36777433878a825 SHA-1: 0f28dcae35106b584bf177d053e06996ddf658d7 SHA-256: bcdfe8932615bb4fd38196bae1e4419d5fe522bb452f3f0b46bddbd2fa41378c
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised CMS platforms or disposable domains. This suggests the document is designed to lure users to malicious websites, likely for phishing or to download further malware.

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://queure.ru/uplcv?utm_term=fake+gps+2021+apk PDF link annotation
    • http://akcjonariusz.com/UserFiles/file/dofavanutekowazuzit.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/sijesidelazogubezo.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109101400284957.pdfIn PDF document text
    • http://espokebar.com/uploads/files/mafedaluduxatarada.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/aea0b539700c0de129ac42c24997a852/saridukodimurimu.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/16630810209.pdfIn PDF document text
    • http://eva.am/files/704a12c7ab800a4f.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d60efc0591c85f890706bb88e2d4dfaf/92536735913.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/pabiwiwexiduduzoba.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/83502154579.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/wuzogabogir.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/76682208332.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/88645034089.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210921032349.pdfIn PDF document text
    • https://granitnet.hu/editor_up/wenaxim.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jovewixenirugiwuzovonave.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/33811814348.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/7256607701.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/f8t2dlo084hg55qc604f609mv7/51544362884.pdfIn PDF document text
    • https://patoman.ro/ckfinder/userfiles/files/96526953710.pdfIn PDF document text
    • http://skupka54.ru/upload/m/tusodixutitigi.pdfIn PDF document text
    • http://tahokart.ru/userfiles/file/52856392911.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/15080525121.pdfIn PDF document text
    • http://cy2hand.com/userfiles/45137747945.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_off0000bac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D4 18384 bytes
SHA-256: 0c7607071dc78bf19b1eb781052415903c8f9ef33cf298be4b89d89130cca5bf
font_02_sfnt_off000102d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D4 10232 bytes
SHA-256: eef475ee1879cc5d602ed8ca5c979cfad671bac64ed25aa0ed66767b55324c46