Malicious PDF — malware analysis report

Static analysis result for SHA-256 7796ac3ed625cd98…

MALICIOUS

PDF

93.5 KB Created: 2021-07-23 12:29:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c61dda6f1ed78f4feb81cb9a86c9bc44 SHA-1: 80a354b6828571234a999ee36c6ee224df28484b SHA-256: 7796ac3ed625cd980a2ac3bef19b8e03b3508a65b272ec116713223502fe6e0d
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing trojan. It functions as a link farm, presenting numerous URLs that likely lead to further malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a deliberate effort to obscure the true destination through a large number of links on disposable hosting.

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://asesorgubernamental.com/images/file/pepimawikijegusuti.pdf In PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c57f1d154b9---wujarilus.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b22e0bbbc1d---gimidapiko.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/75125226298.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/3ce0ltucbsm7o4lomk5e77emgd/foxovomonigixumawavas.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/wusibemetiregezimiv.pdfIn PDF document text
    • http://cncforginghammer.com/d/files/78158817779.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/55332003454.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/82334276791.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/120e18d61e01db104501d2128149158d/80040684660.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/10481939348.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160f32774b28c0---miweturezus.pdfIn PDF document text
    • http://gps-ambroisie.com/ressource/site-image/files/18853688134.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/66016055236.pdfIn PDF document text
    • https://bdcomunicazione.it/file/bivofekisetodelov.pdfIn PDF document text
    • http://24cvety.ru/upload/files/mevomisebetepogekovuze.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/sajetedebofewaxuvif.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7f6fde3dcc60824f049906ad0e62da95/27328409257.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/76605129865.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/gakod.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xarumivobomifitafudelami.pdfIn PDF document text
    • https://rajaketiga.com/contents//files/67757331682.pdfIn PDF document text
    • http://peusch.lu/userfiles/files/xewuma.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/vodivebemisozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=funny+easy+riddles+and+answersPDF 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_off00010b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 10300 bytes
SHA-256: b167ad336d9cdc43c65f9ec82415e84aea9b6e208aa920d3cd6f1b2bbac954d5
font_01_sfnt_off000122e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AF9 17324 bytes
SHA-256: b78bec65a6504cf7660498f65e7d4f82f880214733d37c2f10ec2b0b3aa2fc10