Malicious PDF — malware analysis report

Static analysis result for SHA-256 58d2dca928dd4f32…

MALICIOUS

PDF

87.2 KB Created: 2021-06-29 15:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 31ff179e9688144e42b6c02d659888a8 SHA-1: 18a338c71e1f3a9b2d38a994f0eb5b2e94535922 SHA-256: 58d2dca928dd4f325199bbbacbce0c8a5e62ad45b93683fafb01d167e34f50c1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting it functions as a link farm to distribute malicious content. The `utm_term` parameter in one URL indicates a potential SEO poisoning or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://smidgel.ru/uplcv?utm_term=online+released+movies+malayalam PDF link annotation
    • http://wib24-admin.de/uploads/file/43405472280.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6bf982725---78154019000.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xirodavobez.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/3c3cffe25c8a0663a7d9e0b33d0adb2f/47593830681.pdfIn PDF document text
    • https://giovannicaputoboutique.com/file/xazipozafejiwakaxez.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/jevaxuzezexalebaramas.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/85465174922.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d4d2ffe58035f7a806c5a91be2b98318/54626309279.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/7mi7r9e59uf1aud7ni64b1dnk5/13986482514.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/71248169036.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/92c0b677a55cda0e95d0802fa1431a5d/36098916801.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/e2a5feca9e1dda246fb012c2b1403ae9/vikilo.pdfIn PDF document text
    • https://robert-zauer.cz/userfiles/file/ximujimu.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/nencclm83ogptms6tmdhauete3/76883386031.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/xizevojuvuruxabaw.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/sekevomatikux.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160943936a5aaa---lafujiramujetawegevog.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/o0r04hkdcosum9s1v04ht3qfhl/binakuzemoluk.pdfIn PDF document text
    • http://schnauzermountainminiatures.com/clients/17729/File/sojibokobizakodok.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/8e4ce34cb23f641ddf7083f49b9c2897/tomanuno.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/75784778777.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/piwuwazoxobu.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/mumipajup.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/majitipuvozokulisu.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_off0000f254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF254 17244 bytes
SHA-256: 37bca551f3b8bfeff060286bceb15d005557640bc9fd3e6e098d2f0e587788b9
font_01_sfnt_off00011f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F56 10516 bytes
SHA-256: 57d661d116e2b17175d3c24f4c41fb75fdd1aa0f0b00bec668c6e86fc09ae21f
font_02_sfnt_off00013742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1