Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a60992747820bd1…

MALICIOUS

PDF

82.5 KB Created: 2021-09-17 23:50:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36ccb094510da338f46db68e46d84fa6 SHA-1: 461d715dbbe4555da93fd61dcf82c5289b28beb9 SHA-256: 4a60992747820bd1ae23289937924d978f9794f0dd35406f99a39152fdaaaedd
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • 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://nomylo.ru/uplcv?utm_term=tiktok+apk+download PDF link annotation
    • https://esperanzadeavila.com/fotos/file/26149536629.pdfIn PDF document text
    • https://flyags.com/editorResources/file///23277102926.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/28023735914.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/55690846237.pdfIn PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/pojivojazuxanodunogurur.pdfIn PDF document text
    • https://giga-tronics.com/userfiles/files/liwasuxobakori.pdfIn PDF document text
    • http://silver1979.com/upload/file/7723517035.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/tomimixa.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/87991827792.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/nluknisp3nl7svsrvg12fcv4s1/benutixowupuse.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/95060481343.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161309a450ab58---nenudanemowedaxo.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/jinodaka.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/tunuwugutedavidokeju.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kizixinoledupa.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/fakulikebulikizude.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/40345525009.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/8581619580.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613e4e083e82c---16591562999.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/karekiwovusaro.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210906215513.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/pafujopazu.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/4e7cfbc56f070cca6c87ae62e99a8d50/mepoviko.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/nixumulikekodanuxo.pdfIn PDF document text
    • http://sm300159.agchost.com/userfiles/files/64469572266.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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 18280 bytes
SHA-256: a28002b5e2c24a4e9cb863f49d836867c33774290bddbe1087125eb4efa5bb23
font_01_sfnt_off00010d89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D89 10124 bytes
SHA-256: b5ed835cb19678477aa97ba9abe8ed7cee1a0bc5023f7762d29b8c8afd52cd84
font_02_sfnt_off00012453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12453 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1