Malicious PDF — malware analysis report

Static analysis result for SHA-256 db88f05dc1edb55f…

MALICIOUS

PDF

85.9 KB Created: 2021-08-26 05:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 6fdd7142f64b936fc977a3df4d574454 SHA-1: f952f04b610765d978d5417d06f70c53bdc96c64 SHA-256: db88f05dc1edb55f82d1d9e4e608a374e33457a27a4162c14a0796f405c3ce7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms points towards a phishing or malware distribution campaign.

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 https://synerhu.ru/uplcv?utm_term=wifi+direct+for+pc+download PDF link annotation
    • http://geombiagioschettino.eu/userfiles/files/ziwuziroraviragonaga.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/ligelopobibo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f80f3dd9e---lovag.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ebcts4j3eburfl3gpvrtfk6t1f/80584939759.pdfIn PDF document text
    • http://ed-web.cz/userfilesfile/40706943986.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070d5e31a80d---13540644365.pdfIn PDF document text
    • https://thefertilizerequipment.com/d/files/86306691916.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/65970671067.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/55005545764.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/okb7fkbr9831795o5oml1n1ibl/90252841569.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077e326ba3b8---muzawi.pdfIn PDF document text
    • http://pk.mo/userfiles/file/78001231512.pdfIn PDF document text
    • https://faceless.me/userfiles/files/nakokunalofix.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107343707575---jokabototi.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/f3abd17a6b55d8fc26d3ae12a6d6788f/17467364799.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/91ae0f83c2e70e99839735e54217719c/paxibopobafoxemazisavoge.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2492e59cb---mesidogajinizifaxamexan.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/29305280975.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/8c6fbab903a9aa02307e1abfbec684cd/widejoxoxuvubes.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be97c5e93e3---gevokejezebunon.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/55202285970.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210813101512.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/61302607123.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c561528d191---pakiwopusuxelif.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b7b33ed155---muduj.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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 17460 bytes
SHA-256: 4006045ba5adee3c890d140adb740229961cbea4d42d671365524dd30a8bb389
font_01_sfnt_off0001185c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1185C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13073 10524 bytes
SHA-256: e6f9eea2d384708c788c4521b179ccfbb5c8fc92a06d257d486db934b32fcd15

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