Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e050da5fd99236b…

MALICIOUS

PDF

76.4 KB Created: 2021-07-20 14:00:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e675844f70404c87b5be9a8ed9f29dd4 SHA-1: c9907dd6f45e9f7e5d439c9c9378c1a260b34337 SHA-256: 5e050da5fd99236beef3761aae6e7daf27b9f6369ebab01294aa3ba7fce118ac
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The primary function appears to be redirecting users to external sites, potentially for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://nationalshield-uae.com/userfiles/files/33705526184.pdf In PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/meh8jj1jver59p7ga53eua7bm2/gotirufa.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/jlctctbjt3ggdll094c7vfoi74/59620406934.pdfIn PDF document text
    • http://smit-electronic.hr/upload/datoteke/jurenim.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/zavudodifafe.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608590c56983b---peneloxedizineti.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/44270553395.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608bd3644bdb4---pitozur.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/bukapewigesenepodebof.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160727abd410fa---vukizatuvewutaligudijotej.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/13252315132.pdfIn PDF document text
    • http://gloucesterclassof81.com/clients/23558/File/baguzi.pdfIn PDF document text
    • http://www.bufolari.com/public/immagini/file/66635179137.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/webudakikovusesori.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/pajv9qu4lsar6vgd48603mattb/45671451543.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nk6mba1uf7m8hukbjag4ibns4o/40077754919.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160731305c767d---feniz.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd7b559d497acb2084db7c558fcc90a7/buzitewopomifi.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/dewifekezuvonalivewig.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/f5fe6419fdeceff2a7dc0089aa124d75/54796763556.pdfIn PDF document text
    • https://srmhospitalities.com/images/bulk_images/files/gofajolubajevexizexomimug.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/bumazikuzizutonitod.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/afe41188822a6f5056157f733d0b3f69/94942217218.pdfIn PDF document text
    • http://seigyobannkaigaikikaku.com/ckfinder/userfiles/files/viwamigitijegipa.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/zilufasaki1625677468.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb704eb94---70110501545.pdfIn PDF document text
    • http://gustosandvic.com/ckfinder/userfiles/files/lodabejokisa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=pizza+shop+to+rent+near+mePDF 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_off0000ca73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA73 10532 bytes
SHA-256: 08b41ba3bf8be4692b478a5ae59c34cf2c37658ce1296aa246611a3cb560d1e2
font_01_sfnt_off0000e251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE251 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA63 16344 bytes
SHA-256: 52b262f9ca1bebb8823c3b493182c8306f528673dccd78b03a097e093dd0386b