Malicious PDF — malware analysis report

Static analysis result for SHA-256 804238fa9edefed8…

MALICIOUS

PDF

93.3 KB Created: 2021-09-07 11:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8d2e41b29d1a80daef4c1e852ab059a8 SHA-1: 8abe759a6b04b89fce153f937ecb71fdcf153ce1 SHA-256: 804238fa9edefed8f769ae39931f2ee32d91aa1a5a6468cc9ec66fd4c8c424cd
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the presence of numerous external links suggests a redirection mechanism to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16107ffb17a17e---99656883114.pdf In PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ba069992---luwozimonuwadat.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/55556649567.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e91afcf622---35892183879.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rupipojekesuvevakakabo.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/13966798769.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/0f4a790528d6fb45c70433e5b6b6b9d8/85666632273.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/78547980635.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a50fd4e851c---sovowuxozibatasemazuko.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/73640807926.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/72c606c8f1afd910418ebd51774e336f/59275175842.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfb28e61bf---xapagudelo.pdfIn PDF document text
    • https://wonkingchina.com/d/files/zuzir.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/7292210366.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/lilexezafutezalinu.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-8-14/20210814083020639252.pdfIn PDF document text
    • https://www.sixteengrams.com/wp-content/plugins/super-forms/uploads/php/files/hnpckjccr6g0hn8tvmd8j1nmn7/lulut.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/fea6eja09a7tfen0gm33oqep4l/dudabikefekakadixiti.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f6c5b4610---xujovam.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/s0kn6b21oe1na601ldvno6d443/sabozoradijumasazekisax.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/56186085822.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/05b5df7b90d21892fd36cd14e0a0070c/xorufufonupojajetu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56e8525f25---punetotajozifulegebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=ritmo+sinusal+normal+pdfPDF 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_off000104df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011cf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CF6 10672 bytes
SHA-256: 8b8d83e903a0a4e6dbb65c5903413ef492aeddcd01ad8877d4d11a06f692d3c0
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 19388 bytes
SHA-256: 140e0cc4805a5cc6954c0cabf796bcd2e90fec9502fd899c3dbcf01f7664424a

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