Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6904445881af69…

MALICIOUS

PDF

89.2 KB Created: 2021-09-23 20:29:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b253acaad4a1612ee21810999b1dc4e4 SHA-1: d72eb22cd631562081493187fe6636d92a7c1d1b SHA-256: aa6904445881af6923e321cd88cf7dc4b92c4b4b2061754ecf28443cedd5bb82
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135108bed1e8---70851351334.pdf In PDF document text
    • http://gidaero.com/upload/fckeditor/file/lisakinitevepud.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bef5f34d0c---xakuv.pdfIn PDF document text
    • http://rainhouse.kr/data/editor/file/209469348613e3adc68108.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/27712168414.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/96395203834.pdfIn PDF document text
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/73617915446.pdfIn PDF document text
    • http://chayka-svg.ru/files/rijepewa.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210905_A467188C097083C2.pdfIn PDF document text
    • http://domosplast.hu/files/file/borulekaxonuja.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/1oghjdmis0jihgp3qhvum47sdg/xiloputuvifu.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/94528893040.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/73011762046.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/xujivemotimudifiwetuw.pdfIn PDF document text
    • http://dnepropress.net/files/file/dudamokumagebe.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/joduxuvogeridatixijoxuvot.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/raxovuxubiwikif.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/likifaribavam.pdfIn PDF document text
    • https://associazionebriciole.it/public/file/16275484179.pdfIn PDF document text
    • http://dptour.net/bot/ckfinder/uf/files/6553166801.pdfIn PDF document text
    • http://tecksco.com/upload/files/83576884697.pdfIn PDF document text
    • https://klaipeda.cvzona.lt/resources/img/files/goginowulodawen.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/44852094249.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/sivugijakevuleditanonixix.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/nalozawakigogutuwivat.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/kizeselibewexasagi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=watch+just+go+with+itPDF 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_off0000f686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF686 10436 bytes
SHA-256: 4e9230eefaaefd01881fb19d8bfdfdeef37802ed7f628b5c33b1af335fd7fa8f
font_01_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 18716 bytes
SHA-256: cf869387eb8b500568a1b3e1d574792c0378018aa093df6aca939bc4760f7f0f
font_02_sfnt_off00013eb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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