Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e06eb4c3d08306…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 09:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6dad988b47f83852b47a057e767ea2ba SHA-1: 9d6aecf22e4b88357d49e46b5bdecd0e9624b4cf SHA-256: 43e06eb4c3d0830696209b2ecdf3cae203b249a71720e01891a680084a124555
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms hosted on compromised CMS uploads, designed to obscure the final destination. These links likely serve to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161409f8c4c1fe---66340402926.pdf In PDF document text
    • http://bytip.net/filespath/files/20210915223536.pdfIn PDF document text
    • https://biroestarsa.hu/uploads/file/74102236990.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bd9bf23fb---48338273182.pdfIn PDF document text
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/fosogajufiko.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/61652692050.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/20113189006145617b11b01.pdfIn PDF document text
    • https://unitjaya.com/contents/files/fodujetelezuxusijozujisoj.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/zubitupip.pdfIn PDF document text
    • http://adbrf.com/files/fckeditor/file/3406999066141d5c901c1a.pdfIn PDF document text
    • http://it-hair.com/userfiles/bixamufimapakonig.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141233e80fea---vizufepef.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/5270250183.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/nigigolepowejolizagen.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137983c789c1---50192736271.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/73057455427.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/75999229731.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/wijifenutirojuzi.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210907_43706B2E8BBF6EBE.pdfIn PDF document text
    • https://e-midas.ro/files/file/45910003376.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/nefafemebimovove.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/9602921760.pdfIn PDF document text
    • https://noticky.net/akce/fotky/file/patopumuxuzapasepok.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/44547798500.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=mini+militia+hack+version+download+unlimited+healthPDF 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_off0000d364.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD364 17376 bytes
SHA-256: 285b4fee098776e3b8a6ff5a9c719289fc93d0028a359ea1e695ad2232e6b607
font_01_sfnt_off00010033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10033 10972 bytes
SHA-256: 240c9b3bd59b135789aedd92530fcf39b5c368ec3af89ea4dd7ec3b84a1bd9ed
font_02_sfnt_off0001198c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1