Malicious PDF — malware analysis report

Static analysis result for SHA-256 13bf8811546ba61f…

MALICIOUS

PDF

82.5 KB Created: 2021-09-11 10:46:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6bfed7da4680f3bce869405f17d96844 SHA-1: a44e158aec2f3bcc9fa8a5d60de206bf65fd6b52 SHA-256: 13bf8811546ba61fd428982a0fea63d8440441e0aeb6461dd9d552f8811de1f2
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, with several pointing to potentially compromised websites or raw IP addresses, indicating a redirection or download attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of multiple PDF_URI heuristics and the ML detection point towards a common PDF-based attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://romalasergroup.com/userfiles/files/puxuxipikujawolupeke.pdf In PDF document text
    • https://izr.fr/files/lewinamamubaxemut.pdfIn PDF document text
    • https://shindah.com/images/ckeditor_img/files/jomemuxuxamolefopelejer.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/47284700999.pdfIn PDF document text
    • http://sgpeo.pl/users/file/40081308934.pdfIn PDF document text
    • http://opt-russtd.ru/data_center/upload_pictures/file/39176080926.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210911_152805.pdfPDF link annotation
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394eb9b4a05---tilebufitux.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/gupatamowod.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/37327330760.pdfIn PDF document text
    • http://zhfangyuan.com/uploadfiles/files/popidawarobas.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/72829904139.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/4385773817.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3d5b06cd---6675002025.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/disoguke.pdfIn PDF document text
    • http://th-hl.com///upload/files/mijezoviduxefixukifen.pdfIn PDF document text
    • https://cbdc.co/uploads/ckfinder/userfiles/files/fazewarinavadopuf.pdfIn PDF document text
    • http://elsped.hu/files/file/zufosujitibe.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/bumavigitodefobimilonu.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lekogosuxupotilonojuwad.pdfIn PDF document text
    • https://etonbio.com/newsLetters/images/file/94283301847.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/00ba2c9b766e10b49db95c7ca2478948/45482565146.pdfIn PDF document text
    • http://vidol.eu/userfiles/file/moruvojamizedanozido.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/tifuxogawuvogalurebopujo.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/30076107060.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/kisas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=dropdown+menu+uiPDF 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_off0000e0b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B8 10264 bytes
SHA-256: f9571acdebe7e101fe77cda5d4b9e94dd739f95743065e3fec7057eced993f98
font_01_sfnt_off0000f7b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B8 17044 bytes
SHA-256: 641205a1d1ed3d3b420ab4fa26f3638c1808aa829811265e2940d68e060fdddd
font_02_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1