Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f164ba4a0b673e7…

MALICIOUS

PDF

72.5 KB Created: 2021-09-01 20:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56efc2dfc963058381658f20d0bf0df4 SHA-1: 44390a616437e095026860ecf29d68e1fe3c7fe1 SHA-256: 9f164ba4a0b673e7443dec19cf4321837983206c6c006e1bec23ea816a9e6f6f
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The document's structure, with minimal text and a large image, is typical for a screenshot lure designed to trick users into clicking a link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 72 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://pixomot.ru/uplcv?utm_term=differences+and+similarities+between+phenomenological+grounded+theory+and+ethnographic+research PDF link annotation
    • http://csc010.com/userfiles/file/20210629015242_p8jexb.pdfIn PDF document text
    • https://codecs.ro/images/file/11603671453.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/877ebb87c8836411bd48e21e7f0e601d/dukulenuxasip.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb31545e00---46807105670.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/002daeff442bb7edf7e6600a3b87e975/zewewajefosidezi.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/33494944838.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/segilejip.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c083cbdcaf7---zatesonepu.pdfIn PDF document text
    • http://zonweringbelgie.com/ckfinder/userfiles/files/16068318134.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/mepulevedijex.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/69590715390.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/831523dcaef9f18d3af58fcfd7ac741e/gelodirelel.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/02b97780c910012936c34637b7cf1b4a/75651622488.pdfIn PDF document text
    • http://edwindijk.nl/home/edijk/domains/edwindijk.nl/public_html/uploads/file/muzamabifigiwalowemimeki.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/38529299853.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/xizavugudazarereno.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc3f265c0c6---xumewes.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/02210cdf6cc5996c64ce3f64061e2fbb/49844273268.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/worugawimen.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/39200619339.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160750662c6ed6---xobelemobanoju.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/76014761931.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/pumavagipemavafiza.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d99ec88a245---zogavuwokanuji.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_off0000bb40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB40 13720 bytes
SHA-256: b4b201b2e7e0be664b8c6d92ddb7bda17a9877cc75ec629715f296ab6f7def72
font_01_sfnt_off0000dca8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f4bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4BF 11508 bytes
SHA-256: b3bcac3e6ffbbb35718671d5036e0100adb11e8498cdbe3917fb04c4ea826a8f

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