Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c80cf148e92538f…

MALICIOUS

PDF

72.2 KB Created: 2021-09-18 07:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f1be224ac911bfbe1fffda734b198b51 SHA-1: a31c03f460e84762e835f48abceb9c6a379f8f9b SHA-256: 9c80cf148e92538fe3a10bbf1980560aa44bb1d35eaed514f1609d1d2e299de9
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised WordPress sites and other disposable hosting. The primary purpose appears to be directing users to potentially malicious content through a network of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://anapharmata.hu/ckfinder/core/connector/php/files/munigasesobowarezenek.pdf In PDF document text
    • http://bet-balance.com/userfiles/file/gelukilopedimefegupor.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161364d9f9aaa8---zariv.pdfIn PDF document text
    • http://belean.pl/userfiles/file/63416175620.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/55615367929.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/110abac75adf30e80fe61b8360ee41d9/55740878546.pdfIn PDF document text
    • http://euro-ex.net/images/blog/file/wurodufuluw.pdfIn PDF document text
    • https://www.habitat-morvan.fr/ckfinder/userfiles/files/48850242321.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/jivoxabofuluzu.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/62360221329.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16144077435f94---57727849506.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428f0c8c479---sozumikimisozine.pdfIn PDF document text
    • http://weldingplaza.com/files/file/78729698559.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/fusulanerovipanit.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c483dac713---97714773525.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/miwezigolopoxulosi.pdfIn PDF document text
    • http://artdental.hu/editor_up/9697296842.pdfIn PDF document text
    • http://riversedgefm.com/files/file/79489259590.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/9291330664.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/fodomotepizorifatiniwib.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398d9ee9409---xesinitete.pdfIn PDF document text
    • https://kindeeyudee.com/ck_files/files/84532881862.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=can+you+send+invisible+ink+to+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_off0000b762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB762 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF74 16648 bytes
SHA-256: 3e5ef07fe0aabc343bb5e06eb8419cddefe468e09a82141e80b23a222b39bca5
font_02_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 10784 bytes
SHA-256: 0fc47fcfc6fc97c21aace01c3691af432f4591810b70a3a22e9622eaf69bcc9c

Open this report in the interactive analyzer, or submit your own file for analysis.