Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b9e061dc5015e1…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 10:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0b5865d5028c30cc98a6cc192b775ba7 SHA-1: 5b72721484c7a1515d48b3655ef45759c920e96e SHA-256: 80b9e061dc5015e111c08974b0dcf9acb194611359a85f5040b287ef5d29a367
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://www.motocams.cz/ckfinder/userfiles/files/bexitubop.pdf In PDF document text
    • http://tuning-zone.eu/userfiles/file/poretozojuxewabu.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/96266882612.pdfIn PDF document text
    • http://tano-cable.com/d/files/84242465849.pdfIn PDF document text
    • http://klientskazona.radeton.sk/ckfinder/userfiles/files/gifizibavexunupafe.pdfIn PDF document text
    • http://gyuco.com/uploadfile/files/20210915_170725.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ceb1a28d---nilimitirobuz.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/96215479108.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/50169793331.pdfIn PDF document text
    • https://whereestar.com/marinarubicon/admin/file/44702847359.pdfIn PDF document text
    • https://www.temtechnologies.fr/ckfinder/userfiles/files/dusudoxulofixirugegid.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210925094912.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/werilivupomimomowukod.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/57570709785.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d5eaeeb9d4---29091399.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/27326249871.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/pukot.pdfIn PDF document text
    • http://kursverwaltung.fit-n-essen.ch/ckfinder/userfiles/files/lijezapiwumiwoxomokozevi.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/43643581524.pdfIn PDF document text
    • https://gitimohammadilakhimpur.org/ckfinder/userfiles/files/72103251964.pdfIn PDF document text
    • https://ccvt.vinaonegroup.net/upload/files/sexom.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138332bbe1a1---91184232762.pdfIn PDF document text
    • http://pattarasawat.com/ckfinder/userfiles/files/11143742400.pdfIn PDF document text
    • https://tjpapigroup3.com/contents/files/xexudoretuvajesoseguxa.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/77207970440.pdfIn PDF document text
    • https://ysh.my/userfiles/file/69220596836.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=free+fire+permanent+gun+skin+apkPDF 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_off0000ba98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA98 10704 bytes
SHA-256: 1228ba5d2fa131e896b79fc1fb88a9546a84e2f8bbe84377ccc7162677aabb86
font_01_sfnt_off0000d322.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD322 17932 bytes
SHA-256: a8212a51eeefadf89085ac0adebf591c8edde41ccbae1468abc67ce4c6329634
font_02_sfnt_off000101f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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