Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca30818fc6f38d0e…

MALICIOUS

PDF

85.7 KB Created: 2021-07-07 04:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 51119b7edd5ab4f2238b1d587b89f443 SHA-1: 89132e9b2302107f71a575dc457c0acfe9d7b659 SHA-256: ca30818fc6f38d0ee3c4ef16a39beefbd5166e428f95a68173f1cb79a995b846
164 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to compromised websites and disposable hosting, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a 'download button' lure further supports a phishing or malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://sinhadventure.com/uploads/file/14872992702.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925c1435895---95337318977.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/m6c4rtlmajo1ip8km1dhbulstl/wukoxiputunal.pdf
    • http://ubest.ru/images/file/jepivipurawutinotazokoke.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/2dvmmobuq2gnbrdu26druadtj5/92961072100.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160807b1e0e26a---daxujigifofadowirituguwa.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2dbaa4a6a7---megaxulofezujikabamemujur.pdf
    • http://debandhelder.nl/ckfinder/userfiles/files/nilanegewaw.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1608f03fbbb1c9---pidasadefedukuza.pdf
    • http://jullien38.com/ressource/site-image/files/pusukusolerebabati.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a095fa24339---34427080385.pdf
    • http://sns.hu/_user/file/lodutoxalipu.pdf
    • https://activepymes.com/pub/file/54397329769.pdf
    • https://aawyx.com/sites/default/imageuser/file/93153991239.pdf
    • https://www.reflectionuk.com/wp-content/plugins/super-forms/uploads/php/files/f338cm3ghcfadojpme9eq5ujrm/25048213011.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/5873418c8ed38aa9857726c19c528cab/vegevudugilobifuwo.pdf
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/df1f600191e147231611930f38f8f729/tanixaw.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/550ef8d9c693aaeaedd9207d4f833e72/64134153917.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d089ac68fc---fezodefevozupukegiwigu.pdf
    • http://toyotarenta.net/FileData/ckfinder/files/20210707_6EF06BAA29338926.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b821420e168---42301965081.pdf
    • http://zbraneklapka.cz/ckfinder/userfiles/files/9215315683.pdf
    • http://cnc-soustruzeni.cz/files/file/zawesagurijedapot.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=combining+docs+into+one+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_off0000ebf2.bin
0a0b38d20d613bfb94eae6c89fe822977dea1dca492410a2603161f0ea6e1261
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF2 17260 bytes
font_01_sfnt_off00011922.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11922 16792 bytes
font_02_sfnt_off00013139.bin
a88ba551a1cca9a09b2aa24649d3f150dce226fdc8d96e7957d27e206c898aaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13139 10828 bytes