Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36080abf2267b25…

MALICIOUS

PDF

68.7 KB Created: 2021-09-25 00:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b15dba1c8e3c95b6f0dd2a8c86470823 SHA-1: b3a849fb91dbc4c81a07342be7538545aeeded64 SHA-256: d36080abf2267b25430aad4b8b0932dfdf764ae97636ddfecaafefb699cf5314
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a screenshot image designed to trick users into interacting with embedded links, which point to various compromised websites and disposable hosting domains. The presence of numerous external URIs and the 'image-only document' heuristic strongly suggest the intent is to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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 68 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://synerhu.ru/uplcv?utm_term=funny+long+distance+friendship+memes PDF link annotation
    • http://dinskayarealty.ru/media/file/teziv.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/sujufovokixuxekesabimos.pdfIn PDF document text
    • https://reklama71.ru/upload_picture/kumimegukebuwafutaka.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/49155251317.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/mlhkefg8m999ev92f5lqfhf03n/17937508377.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/39303278663.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/nexawamoxebuvalafibapa.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/pavalapiwelaluzum.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/94779083215.pdfIn PDF document text
    • http://innovarhomes.com/cms_images/file/sulogemoxefetobikuvetubo.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/260d1914a6d49973bf09e663b195c792/36561141358.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613407875dc6a---84618174258.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc70d9bb58---88708318099.pdfIn PDF document text
    • http://tavaszitura.eu/userfiles/files/mitasinekomokosisodubozu.pdfIn PDF document text
    • https://callmarkinvestments.fortunekenya.com/callmark/files/piludiw.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-12/20210912194840902885.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210912104336.pdfIn PDF document text
    • https://eklyps.net/images/file/fazupetogir.pdfIn PDF document text
    • http://savages.lu/imagesRTE/files/xopabofinipodedez.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/peminuwarusonizex.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/bizifopisako.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/sagoradijoparamixativar.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/vetomalegodosokes.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/40816254621.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_off0000aeb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB5 14012 bytes
SHA-256: 2ee068f229318d80aecc65f85a414903231aaac4046b3c1476075b7c45be8be1
font_01_sfnt_off0000d143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD143 11256 bytes
SHA-256: fffdc299a6359a94ecae90fecd19b4c62157e88734d2faf55c383a87e46e6f64
font_02_sfnt_off0000eb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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