Malicious PDF — malware analysis report

Static analysis result for SHA-256 e373d741f32684af…

MALICIOUS

PDF

103.7 KB Created: 2021-07-23 01:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cbd28bdccdac9a3e0bc53f388c282254 SHA-1: c0fda5a926292a25a7e3e8b234394796de1723ef SHA-256: e373d741f32684afd8f247f81b63459cbced8648678532ed00720fa5b6a0cfa6
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting sites, some of which are compromised WordPress uploads. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://shuimotongyuan.com/userfiles/file/fibafowagirilej.pdf In PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/9869209011.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16088c61b7c7bc---vuburofodezidozimuretaw.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/gizeloxujakar.pdfIn PDF document text
    • https://cahayamimpi1.com/contents//files/nusutarixarafovewusumazur.pdfIn PDF document text
    • http://smeclassof1987reunion.com/clients/37165/File/40328983356.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/kenoz.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/46070838648.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/81313997376.pdfIn PDF document text
    • https://pendekaremas.com/contents//files/75307333191.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/98320048361.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607257c10b1ce---62988667444.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/11665527669.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/14424558414.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/55807c685c030bc4803ec2103a6f2d6e/vagusubixofasiwagetosuvu.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609650cab775c---53903711962.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/lonuxagiwexi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/wadulanup.pdfIn PDF document text
    • http://anm-av.de/uploads/files/sepijezepoludusom.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607491ab32d5c---pofifemag.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/3fjv25tl0bv7hnnugelsonnha8/77262437751.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021062609272780554.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/07/file/202107221427326442.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607faee9a5a89---refuvogimogomevebopemuli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=subchondral+reactive+marrow+changePDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/904fbb307daf13df95bff8f355d6a475/2526299152.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_off00013057.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13057 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001486e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1486E 11116 bytes
SHA-256: 8cf2c0d0e6a46b4a311c56a6ee8f1c2ead5642e0c4d776e668931123945baf0d
font_02_sfnt_off000161fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161FA 17432 bytes
SHA-256: e24355596abf50f0c85277ebb1dc90e0ab85ea2c84e7518fbbab21cdb8d003d2

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