Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7ddfc3afe1072bf…

MALICIOUS

PDF

85.4 KB Created: 2021-09-01 08:32:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1bf43f82c70cc208180e14e44c839d75 SHA-1: a02828ec1e621b49da69cab4e99f0520d465c170 SHA-256: a7ddfc3afe1072bf0cacd1f1a30a9697978897407c7f8d0d67c816b3d984aed4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, with a high-confidence heuristic identifying a link to a compromised WordPress upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics point to a malicious document designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/fa93f3adc15e0fba14c9e80fc2efc596/70373601588.pdf In PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ddbd84a6c---16154341816.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/39024743238.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mjs1dov92mvs7cv5oucgel05k5/68690938870.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-13/20210813053021521931.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/fabf474df191dfa041510802730ad375/ganiwimogavakefufusonozo.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/wasopodux.pdfIn PDF document text
    • http://prota.ru/upload/files/sexosugupumuvaraxugu.pdfIn PDF document text
    • https://digireg.pl/upload/feragiwosuteg.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fec671184f---39846835490.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/21202442018.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609765ccd75bf---pimakuvawolesuvilovidofo.pdfIn PDF document text
    • https://serini-cloud.pl/uploads/editor/file/mejofugoxutumoxeluxefotok.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842cd0035e---sukejuwujobepuxatelisedo.pdfIn PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/jenowupol.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210723084505.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b73267e441b---37069158602.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/67738783881.pdfIn PDF document text
    • http://kap-group.com/ckfinder/userfiles/files/napaxonibisusurotufolesev.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/ius7gpsd88is9ivuntulthagj5/44071201229.pdfIn PDF document text
    • https://hagakure.by/upload/editor/files/20212840132.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16087bc79ce38d---bakid.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/fotopodasavakuwirazezaju.pdfIn PDF document text
    • http://lucann.com/Upload/file/buges.pdfIn PDF document text
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/d2b2f4625e8f2b8dea19399a99d1e545/wosotefegukanazimivijed.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/gidalemewenini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=all+of+me+roblox+piano+sheetPDF link annotation
    • 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_off0000e632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE632 18608 bytes
SHA-256: ac5416cff22c2b012f945623b3df2b38e4e46ae5244a7022945d7dbc2d5ee706
font_01_sfnt_off000117ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FD1 10848 bytes
SHA-256: d00b69699121e9c0aa48b4da3a2e727b57b691600537b4fe5346bd142759f445

Open this report in the interactive analyzer, or submit your own file for analysis.