Malicious PDF — malware analysis report

Static analysis result for SHA-256 73f381aa7fe1bcf0…

MALICIOUS

PDF

67.1 KB Created: 2021-10-01 04:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 44a19cca178037e3f22d974340ec260d SHA-1: 905b3c46dfccb3905c5aa07adcbdb51a46508f65 SHA-256: 73f381aa7fe1bcf086aec3bb3dd2beee4f32bccea4bf2c9de8b510cc54ba41af
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document utilizes an image-based lure, presenting a screenshot to trick users into interacting with embedded links. Multiple heuristics indicate it functions as a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the distribution of further malicious content via the numerous embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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=hacked+firestick+apps PDF link annotation
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/08daddc4021d0f3da245727f154db094/32913992022.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/tigadetevam.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210906/file/65604646494.pdfIn PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/sepovijevuvak.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/0tah3hdabrk22tas3ljodsvj34/jumodefivipepimu.pdfIn PDF document text
    • http://snft.ro/media/file/suwavonejad.pdfIn PDF document text
    • http://carneslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jegewegiso.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/161446729ee44c---minalagukapidutugeragideg.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/babef.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/d55ad5c8299d1d697ce86285a571c014/79917083294.pdfIn PDF document text
    • http://stylekd.ru/files/91028439654.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/wexoromijizirelakikefezo.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/buvolubinileruf.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/gopaxalomadabuviro.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/suzuliveme.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/nasoxobodelu.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/a54d5d1d1399ff95f128789ba0448303/35356313548.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/83906943656.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b339a8415---30053144899.pdfIn PDF document text
    • http://asijskepotraviny.cz/files/file/kebax.pdfIn PDF document text
    • http://www.ih-consultant.com/ckfinder/userfiles/files/3951437394.pdfIn PDF document text
    • http://xn--brneneskontor-landsforening-b0c.dk/userfiles/file/tonarex.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_off0000acc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACC9 10428 bytes
SHA-256: 90b4276419aa049bf0f9f3c137586f0ce64bddc015f1494c5c7147313f65eb67
font_01_sfnt_off0000c487.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC487 13984 bytes
SHA-256: a4e4e829ac88faf15a8d2b1d6967b0958fa7b7e0150a0dbd24512937a13105c1
font_02_sfnt_off0000e73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE73A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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