Malicious PDF — malware analysis report

Static analysis result for SHA-256 e846cad691bc1885…

MALICIOUS

PDF

72.0 KB Created: 2021-09-26 03:23:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 165c61b1fd5fe4767729e338d22d7d54 SHA-1: b3d73fd51553a88f47b10e08ec507b8ee1d96bae SHA-256: e846cad691bc1885ba5fb237d0040ba4d4406a236d137da63e80e1d0818a5430
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of numerous URLs, including those hosted on compromised WordPress uploads and disposable domains, strongly suggests a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://drafthe.ru/uplcv?utm_term=how+to+remove+gmail+account+from+android PDF link annotation
    • http://7seapharmtech.com/Uploadfiles/files/4315079999.pdfIn PDF document text
    • https://www.highlandernepal.com/assets/ckfinder/userfiles/files/deledewesedisezezewafo.pdfIn PDF document text
    • https://bem-sa.com/img/file/9795326459.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161433fe64419b---najopitar.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a22f67ad6---pilobaxegel.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/3010979430.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/69054568954.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/13471788886.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/66618620500.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/veredolekotenisig.pdfIn PDF document text
    • http://ipceurope.be/assets/file/46121169289.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/21973274209.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/rarerizimomopokeni.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/21022491549.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/d43b9c5a63d0c2f279facbf1491518c1/vogeduvapur.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142c16ea5fb4---89555290296.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/87501901692.pdfIn PDF document text
    • http://special-pharma.com/upload/files/57953739276.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/89845420713.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/70916673370.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/tizapijifejakido.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/32654118487.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///bupijexevejefazukejidefo.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/3345727059.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_off0000b362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB362 18408 bytes
SHA-256: 11833285ab509d2550705cacd202ad6f84dcc9834d40687cd1c0046b57936abd
font_01_sfnt_off0000e170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE170 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF987 10892 bytes
SHA-256: 54f2e462d84a19d55214985b6eb7b46bdc6d5b557d5e5098f4092bcd3867eeea