Malicious PDF — malware analysis report

Static analysis result for SHA-256 091812b5b36ad805…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 06:25:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 94090d4b93b61b4c44dc68c4120d3ac2 SHA-1: 23c4fe35dcb1f5fdfb5c33b51dee61d8226fb8b3 SHA-256: 091812b5b36ad805a4378d2dd69136fbf8b9e0cde8d75eb661264a73b06feaba
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many of which lead to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these link farms and the overall detection suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/ngbcrtgkkgdiu7mclipbumknbm/57828030235.pdf In PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/kajiwiputofelameko.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130e606c9fcc---20891008065.pdfIn PDF document text
    • http://propellerclubsandiego.org/uploads/files/tozowogiro.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/lutogisolagubofijif.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/vajibagiguku.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/32516066488.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c4eab095620---zivutupafufofavonutetiki.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bea9441dd1dcb993db1e0e6b194e51f4/wudakozetetapededaji.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf34536013---14979643384.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609519f5b5965---mosidewawiwofisugerit.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/5gniqj2s7p5lcsvbk0kf667btt/20802037169.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/96385513885.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609380369ed5b---85616348164.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/63435315591.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/84190499060.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210719210621.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/23ba211dc1401c3d9132d0d06cfc48d5/38742343621.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/c827b81700de04eb751a4d5592710f24/rebotusozijonaxusuki.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/subexi.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b33e1c9a5---riposoritotakizuz.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/lajagerobosu.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f1ab44b36---suromoru.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afaa4bc6ec8---zofasakazojetejezakakis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=drug+and+alcohol+evaluation+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_off0000e18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18D 16756 bytes
SHA-256: 75fced89a5d7986c399e16a6dfb3984304e7bc66aeeb0dc9742d97b20bde5f03
font_01_sfnt_off00010cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D1 10896 bytes
SHA-256: 8dd73bbd85701cbdf423214623c5c59014afc6266287d94350ae1d626c03d2e7

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