Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb9ac61b4ab210a8…

MALICIOUS

PDF

68.7 KB Created: 2021-09-26 21:26:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 17ad4e296c72f7555a1ff1030c7062f2 SHA-1: a9d373835e907e4ff9865f5cdd476fd583655e78 SHA-256: bb9ac61b4ab210a868232b81f3c24aea8c07ce832b4e824b6e6d7d06f002053f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. It contains embedded JavaScript and presents a link farm using compromised CMS uploads and disposable hosting, aiming to trick users into downloading further malicious content. The URLs suggest a lure related to popular media to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://laborke.ru/uplcv?utm_term=forrest+gump+full+movie+live+streaming
    • http://naturestuff.nl/siteimages/file/39477161701.pdf
    • http://gold-carsales.com/js/upload/files/37364180297.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348da29a4e6---nisedesaruvigowodupar.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161427e0eefa43---renufewujilemijipapu.pdf
    • https://gilboamedia.com/userfiles/file/78882214604.pdf
    • http://greenglobepms.com/uploads/95408506998.pdf
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/kaxefavodegivuwiwitariwa.pdf
    • http://vitalbafitnessclub.eu/userfiles/files/ximetigidudekesenam.pdf
    • https://samsungklimalar.com/upload/ckfinder/files/xetotuserutuvosanonaxu.pdf
    • http://tramtronbetong.com/uploads/userfiles/file/mifoxefoxopovefavurirar.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132838a66b8b---31614019636.pdf
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/4090878832.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90a469ada---50644589475.pdf
    • https://vanphongphampmc.com/upload/files/sigabokufobamopudamelima.pdf
    • https://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/ninilazikamozugan.pdf
    • http://rilta.net/userfiles/files/11312537706.pdf
    • http://rcot.by/pics/files/gofetenolujogivalote.pdf
    • http://erimti.com/userfiles/file/kusijavuj.pdf
    • http://namlinhchivietnam.net/userfiles/image/file/rapabofol.pdf
    • http://officeharbor.com/pdtInfo/gubuxa.pdf
    • https://alpinashop.bg/files/dilefonuponazabiwupogo.pdf
    • https://holycrosshealthcare.com/userfiles/files/12900770760.pdf
    • http://s292376414.onlinehome.fr/datas/imgmail/file/46772421190.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_off0000aeb2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEB2 16792 bytes
font_01_sfnt_off0000c6c4.bin
cdc428b169bd7d4819f01fb510401bbfc9f35bddca3ca071b7c3596f0bdfea67
pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C4 14804 bytes
font_02_sfnt_off0000ec64.bin
37b32f88b64de6531e928228125abad87bb6ba174a753eba172bd01242a558cf
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC64 10844 bytes