Malicious PDF — malware analysis report

Static analysis result for SHA-256 af5aeec989cbc537…

MALICIOUS

PDF

92.5 KB Created: 2021-07-08 00:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ae89aefc78e5be079daff4302905940e SHA-1: c21468b3910e2be22a5d8a3c36d4079849261c24 SHA-256: af5aeec989cbc537205c14d2e2590331dd09567d646c984a45a2bc9bf08108c3
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and points to compromised WordPress upload storage, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious websites, possibly for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://garglob.ru/uplcv?utm_term=hr+assistant+interview+questions+and+answers+for+freshers PDF link annotation
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092fa4ebb372---59410006349.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/7698958997.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/3c8e04cda01f2a5e42e5889b7f6dc834/suwexivawez.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/fulefetisudovalew.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/roribomab.pdfIn PDF document text
    • http://www.zima.snowcat.pl/admin/ckfinder/userfiles/files/65406196707.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/ed8368357a4623d229a3ab97b85fbece/wefeg.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/xutoxipijilexa.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c15efc89a6e---16909657663.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e2703257075d2d659f1d247d3ac3748c/29917372525.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f947d5343f---xuselozuparadaj.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d3da84d096c---44880240317.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/mamisififavezeb.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lonofonutaraxova.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/32870229092.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/32458874470.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/gaxivofuvibezirejoka.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/mazobotubatalebuvijat.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/7vk4ta71hi8s6i2m5v1kg76i14/mazuwifewagiwibivaxoj.pdfIn PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/a3b42c6ee2043a31691f4abeec9bc6aa/wezesekafubibepum.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/kepisatulazilow.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fd4cdaa01---12889002369.pdfIn PDF document text
    • http://darstin.com/userfiles/files/nekozenegi.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be5078443f4---rejabimafixuvufazevajik.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/a38f04c0ecb7ce8b11e5f4398b024014/5801404431.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_off000106fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FB 17056 bytes
SHA-256: 04be404e869585659158f80d45304b98acc06b9d5291b58cdc347219bfdae923
font_01_sfnt_off00013345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5C 10796 bytes
SHA-256: d114c0fd6db332e407ba0c5dfbd3904fd73bc630a7c0c596cfaa32675d688be8

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