Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9b922972d6f69c…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 08:32:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b986ead76a5e099a75638e9885a47f91 SHA-1: 6d3886cef386bd12b42e0c3ca5202e9966d00775 SHA-256: cb9b922972d6f69c3c4604e90c645748a551338254ef4a06242909b2e93c29b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the PDF is used to distribute links to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://pistant.ru/uplcv?utm_term=two+snapchat+accounts+android PDF link annotation
    • http://status.cz/UserFiles/File/baraxomivinabedulivezisu.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/42970320518.pdfIn PDF document text
    • http://sql110.com/pic/jibitiwerovejimiseluke.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/jafewakof.pdfIn PDF document text
    • http://newabel.com/ckfinder/userfiles/files/nodip.pdfIn PDF document text
    • http://fgosvo.ru/files/files/zugasuvewijudo.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/12951550049.pdfIn PDF document text
    • http://tv-kitchen.ru/files/files/85014967570.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/161462edf2fcf2---3434243852.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1639605999613d54829ccc3.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/50185939337.pdfIn PDF document text
    • http://exim5.hu/_user/file/zolupe.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16136653c8982c---mutikitolezamepepuruzet.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/67340080866.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/tozawagufed.pdfIn PDF document text
    • http://ergakiland.ru/files/files/tiluwa.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416e8467cdc---sugiwovevekifilof.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/zudinijojus.pdfIn PDF document text
    • http://geasit.it/userfiles/files/34302852948.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/53982082473.pdfIn PDF document text
    • http://tyextractor.com/d/files/gogisa.pdfIn PDF document text
    • https://rockeit.com/userfiles/file/65991069708.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133978b6aab4---85217085931.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/51046418368.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/nekodemitilisokawunileso.pdfIn PDF document text
    • https://kanat.com/upload/ckfinder/files/xulun.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_off0000e7b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B0 18384 bytes
SHA-256: a4c54811cf14c186b1d816e3bd5c6628c3363272d0e6cd97f28ed0ecec668187
font_01_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 10584 bytes
SHA-256: 831d50cb1fc45f92711d8cd211309370569cd1ec3c62484311ff9f4e2cb67336
font_02_sfnt_off00012efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EFB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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