Malicious PDF — malware analysis report

Static analysis result for SHA-256 312d35683e5a1cd7…

MALICIOUS

PDF

85.0 KB Created: 2021-08-19 20:10:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 9e9e5c1057e286e41e957b6130f0bb5c SHA-1: e8e2f609f3e0554455023b4137f5f9e442f1b88c SHA-256: 312d35683e5a1cd77c67984a97352cba06f747c724dcc9bb56f3c0a37b975214
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting it acts as a lure or redirector. The PDF structure and embedded links are indicative of a phishing or malware distribution campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add4445f12b---86047225377.pdf In PDF document text
    • http://salocchi.it/userfiles/files/numasavif.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/kepitudozode.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/6869926860.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd2c9736ffe---lufuwipuwakulafe.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c6f4d13add948b5039be445ebf883ea9/sapojak.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/f2e2d3bfd87fa2a4f1bb780638fb0233/59456269249.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/fe3bdda7c5b3e6727ba37416c37b1400/9754719454.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df0a7d5edf---99335566335.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/e85d3014aacc2ec8ad18611f8268bd3c/98323952586.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/jizabafexixogujesivoluti.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/h20c9v7ogs0ahk8q77fsl6tc75/19460814387.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/fd1c95cf866f02505bf662468b760228/28040478927.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/43104194862.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/b7b87c868edaf38886546e4ecb9e16b1/jidibu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/38c093c48b1bbb9449760700e487a3f9/17121430724.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/229969721.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/84778667780.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f99b9da6f44---kemejozugitumozugu.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/b84ff08f6aa3b49c83a33935083a9bb4/14671973342.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/78762544372.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070389e32524---simevobojujufutowigu.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/zisetegufirikekenatupixud.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/11166900979.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/hss22ndenjch1tparvjoo528tq/vedudixajejofininosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=ejercicios+de+palabras+hom%C3%B3fonas+y+hom%C3%B3grafas+con+solucionesPDF 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_off0000df72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF72 19036 bytes
SHA-256: 1067878df0c3c397412f85b883d4562a75475292c6e1824c8c7a8476657c9d45
font_01_sfnt_off00010ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12811 11572 bytes
SHA-256: bc8100306ce6ddfc05a0743c27be29e8180b36bb89b7fa4e981e96374128f392

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