Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc24432aeeba8b7…

MALICIOUS

PDF

95.9 KB Created: 2021-09-03 20:55:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af49494b3055c0b38eac237f7a5461f2 SHA-1: 21b520f0bd8525715d2dccda775cb87a609de8b7 SHA-256: ddc24432aeeba8b764c1e1316972304d43e2ddfee4bbade103924ccb6cc920ba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple distinct hosts and the use of UTM parameters further support the link farm and potential phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://laborke.ru/uplcv?utm_term=floral+design+basics+principles+and+elements+worksheet+answer+key PDF link annotation
    • https://powermailer.in/userfiles/file/kenigidunakegadukatuxifu.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/nazevi.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8a2eb40bba---75327192136.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/goveropurawidagovu.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4beec2789---28362457725.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b6f2be424---jevabidi.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/53484215899.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/sevavikimajalibavag.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/mixixuwa.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9d0bf29b0---povujobi.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/161183df8d15a9---96750580802.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/bolotabam.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/o385pmsm9uamu1okegpil045br/musik.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/61463608300.pdfIn PDF document text
    • https://luminex.pl/upload/file/73672387839.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/3nr516as3fsd08ihip9aiba5fe/murasimedotawifipinav.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/45396464893.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/pdm5badiebclmdmjld4e6ur2c2/doborabezepegowase.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/38snvt4jt7bbbho97tn0i9hshk/62254614028.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/90845683110.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/demun.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/99459605470.pdfIn PDF document text
    • https://maturana.cl/upload/file/94269403598.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108271635194019.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce53468fbb---85811739523.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/zewivaramogaxidukagov.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/2hmdu5cpcmsev44019blrltcn3/13541868566.pdfIn PDF document text
    • http://nanopena.cz/upload/file/52095612122.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_off0001101f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1101F 17708 bytes
SHA-256: 6998e7bde97b0975764064e22308dd1fc35e1c32498165c0df66bd603b2518c4
font_01_sfnt_off00013eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB2 11372 bytes
SHA-256: b49496268f07ba94fdca4fac2edb5fb39ec70446916bd17664ec0b05d8cf98e5
font_02_sfnt_off000158e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1