Malicious PDF — malware analysis report

Static analysis result for SHA-256 0157d83071b4fa47…

MALICIOUS

PDF

101.9 KB Created: 2021-07-26 04:38:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20dd74644b597d12db61812b3a1f230b SHA-1: 5688ba8177ecdd9e9d8a920f4354775161d9e307 SHA-256: 0157d83071b4fa47af6873bfb0d6d7b0ae7bf794786e0e3bea8d7ce119047dd2
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature. No scripts were extracted, but the structure and URL targets are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 6

  • 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.
  • 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 http://andlupa.com/userfiles/file/88237894734.pdf In PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb9043dbe6f---21134372000.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/86164224979.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/240a60f3cb6b9616d04d4a2974696a03/motanupirew.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a49e8a9e313---96976266630.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c5567d732fd---sejotowixukuvuvaral.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/81640030475.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/jajoxiwulodiwamedugevawu.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/28820468330.pdfIn PDF document text
    • http://xn--om2b25zm6igqb.com/ckupload/files/43362424589.pdfIn PDF document text
    • http://teakdeck.pl/files/file/vinerar.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/6uoo1it6qae4bbr4b6nimv43c0/jadudegunumugutikaga.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/24347852236.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/memoruriwulelomekopuza.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/6162927781.pdfIn PDF document text
    • http://teraval.cz/res/file/38432473733.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16097312b39c58---4514904182.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/5t435nficungou566g1rm7mauc/foronedawugewixukak.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8eeedd54b6---60091769744.pdfIn PDF document text
    • http://sun-eko.eu/files/file/71676353963.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/53785476150.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/0d5eb0f71451b6af67f7c9bcfda94009/50699561834.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/42165280762.pdfIn PDF document text
    • http://st03.it/userfiles/files/40897879396.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=como+converter+coordenadas+utm+para+topograficas+no+topographPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/51231bc9ae190f48ce634e604280ef2b/2342860573.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_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 20900 bytes
SHA-256: afc1b99b1b6f7452b0fc3a3a700d92c1eb63f8267aade1c520d99238682f6173
font_01_sfnt_off00015469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15469 11220 bytes
SHA-256: 9573d8af9e7736b5e003c91e1409447ca511eddf413466613e1aed4a518a435a
font_02_sfnt_off00016e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1