Malicious PDF — malware analysis report

Static analysis result for SHA-256 be3236d4d08ab2d5…

MALICIOUS

PDF

72.5 KB Created: 2021-09-26 15:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bb7abd176776cca316a4da3907624ce8 SHA-1: 9a273d6a534d74ae0a2dd7a9adadcf6a9774fbd0 SHA-256: be3236d4d08ab2d56aba7d5dd29edfb3291d0e48fb23e8b86a9f0eeb8a55cabe
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, such as 'https://archism.ru/uplcv?utm_term=gaana+crack+apk', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://archism.ru/uplcv?utm_term=gaana+crack+apk
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141a707540a2---lokamap.pdf
    • http://keystoparadise.com/userfiles/files/bavelo.pdf
    • https://evergreencans.com/userfiles/file/jogofavoruwilepisimi.pdf
    • http://csc0351.com/userfiles/file/20210919120537_xgr9c6.pdf
    • https://asiantms.com/ckfinder/userfiles/files/77210391778.pdf
    • https://greenlakepaint.com/ckfinder/userfiles/files/sobotet.pdf
    • http://medica-brno.com/files/mudizufinonu.pdf
    • http://elai.kz/upload/2021/09files/210926074811186438nb4jp.pdf
    • http://qtjdb.com/UploadFile/2021/09/05/file/20210905_164216_197.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/roximifofamuruka.pdf
    • https://yumasri.com/assets/ckfinder/userfiles/files/36142986455.pdf
    • http://countryclaim.cz/userfiles/file/wavajej.pdf
    • https://igescanada.com/ckfinder/userfiles/files/15915657297.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/vudetofel.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144ec99d7a29---bosexanubaxijobapakikozo.pdf
    • https://taiwancy.com/app/webroot/userfiles/files/nubawomavipuwozowaxisiloj.pdf
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/99887640144.pdf
    • https://tradingphrases.net/userfiles/files/58790029214.pdf
    • https://ehlibeytalimleri.com/resimler/files/tuvapofejaxa.pdf
    • http://korea-seals.com/ckfinder/userfiles/files/67509709246.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130190bd6ebf---niguguzejamutax.pdf
    • http://fertilityupdates.com/userfiles/files/lilulugunijusenitu.pdf
    • http://vigova.vn/Images_upload/files/32615769260.pdf
    • https://malayalamfoundation.org/admin/my_files/file/nurobisafovupuzage.pdf
    • https://supermovi.com/userfiles/files/94009839655.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/balonomanipuxajixedow.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7cf.bin
7a7ef9b8963c923e9b122955e7df93396679e911f15519b58f01877926ae94f5
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7CF 18040 bytes
font_01_sfnt_off0000e6fb.bin
ee94e7d81c12cd366e93d7a6256ae1caab0d01cd11ffe63ac7890170e12bef80
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 9840 bytes
font_02_sfnt_off0000fcb7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB7 16792 bytes