Malicious PDF — malware analysis report

Static analysis result for SHA-256 563ad87f149398af…

MALICIOUS

PDF

81.7 KB Created: 2021-09-13 18:29:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 21bb451e35828b7b2c692422f3890b35 SHA-1: 93b68e70efece3026bbc55381b06f49d8f11c147 SHA-256: 563ad87f149398af97e6d1ff8b7a3bd6d96a2aaea365d16aa24aa67c76a7ab3f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://top-caster.com/userfiles/file/wotuvidemuw.pdf In PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/jiramalef.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/17659399096.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/34525855679.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/woxuwa.pdfIn PDF document text
    • https://photofetimages.com/ragavebutit.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/bamimon.pdfIn PDF document text
    • http://em-mould.com/ckfinder/userfiles/files/mipojavi.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/44705833681.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/gokedodetitajubarezi.pdfIn PDF document text
    • http://alhambra.kopanramen.com/uploads/files/42201169256.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa31a0212e---76702014105.pdfIn PDF document text
    • http://littlepearlbooks.in/data/eimages/file/serokonafimamuzixafe.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e4d345927ccbef761fb294117b8a231a/wuropifufewagumoxowop.pdfIn PDF document text
    • http://thegoshow.net/userfiles/file/rujemorezaxowezefekebip.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109031357083761.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/12189208161.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/36129312654.pdfIn PDF document text
    • https://phunhai.net/upload/files/30099546872.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/7372245947.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/7e6b400e2914abb16843756e285c08f2/90269856479.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f7b6093f1---96997796383.pdfIn PDF document text
    • https://plasy.com/uploads/file/22409439906.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/posus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=pu+la+deshpande+books+pdf+freePDF link annotation
    • 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_off0000cb95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB95 10736 bytes
SHA-256: 3e129b866a17cbd911bc975f080f4196c30eebaab348c4cea2327b53c29166d0
font_01_sfnt_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 23948 bytes
SHA-256: 294d36d4b791924703c8322e7f7e20bda2b56da96ed3719625056d304748bcf8