Malicious PDF — malware analysis report

Static analysis result for SHA-256 57de29e2dbffa07f…

MALICIOUS

PDF

92.8 KB Created: 2021-09-14 08:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e35649bc2186ad31a1cc9da1a25a49c0 SHA-1: a4488ba77e4e92cf9cc6d0b931aec5e182c12703 SHA-256: 57de29e2dbffa07facc1cc432d27f29539bda848084d841f0d13ae9c317b68e3
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the conclusion that this PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 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://allytemp.ru/uplcv?utm_term=my+hero+academia+5th+season PDF link annotation
    • https://signika.pl/Upload/file/xedugejivawikogir.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/metenizuxosabijeluzum.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/51662714737.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/jupatinefunosumoxebagupi.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vinobipavupabiku.pdfIn PDF document text
    • https://medpressa.ru/files/file/gedefuxabapelogokil.pdfIn PDF document text
    • http://emploi.nat.tn/ckeditor/ckfinder/userfiles/files/83587699895.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d80d3098fe---tamorunive.pdfIn PDF document text
    • https://geloracinta.com/contents/files/3557725329.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/4478474815.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/peramaxilijebuvuragavon.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/dotebujofolof.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138000210ec9---fesisanomufeveje.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/vezotugixomolagokusuxu.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/dekawija.pdfIn PDF document text
    • http://safetruck.gr/images/file/35839348086.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/31405714216.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133a55c1b23e---ritar.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/20994415557.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/misebe.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134fc980469c---77151723031.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/96588206030.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/xelifixazosumibaregasama.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/gajobadoxazo.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_off0000f8fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FC 10828 bytes
SHA-256: a537992a436e5440225221dc0cc0c634012dcb0f32afa1e1d5cea0203dec4602
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 22640 bytes
SHA-256: 2a2a55780f420d13a757ebdc76add1e1946fb6288c67488378d19274bbbe2764
font_02_sfnt_off00014d6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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