Malicious PDF — malware analysis report

Static analysis result for SHA-256 495f67372703b62d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-03 14:47:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 01d4b1958439db323c2a5653d829ce73 SHA-1: 670b4d6c87a0a4cb72cfe38ea2dd4fff48669644 SHA-256: 495f67372703b62d29c6415045d6fa4cd8574c5a4ce9f7758d3d39731429c348
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically phishing. While no scripts were directly extracted, the PDF structure and link farm behavior are common in phishing campaigns that often leverage embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://le-lemniscus-incandescent.fr/ckeditor/upload/files/95870132545.pdf In PDF document text
    • http://hotelrealerimini.it/userfiles/files/tituwipukukunirivosa.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/mrsmcokrlgladl0hdn3prsmnr0/21391640076.pdfIn PDF document text
    • http://meijialx.com/ckfinder/userfiles/files/tegipabuwibitulesegal.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/sarokulotuzirerisenebe.pdfIn PDF document text
    • http://alwaysfavorentertainment.com/clients/879371/File/40415047840.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e3cd5bd00---46155163055.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/3f7e1969822de1ba803beb7464f1d7f0/kipizifopelarawu.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/44431754425.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/93594722062.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/tfb8gvh65o2rs03b27hj6gnjkl/lotutinomuluzogameviwefot.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/pesopokefovofaleturubuxil.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/xevodusumulenasobevibuf.pdfIn PDF document text
    • http://usmleworkout.com/files/file/fasifodir.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/wutejevoza.pdfIn PDF document text
    • https://podimercrm.com/img/files/genufonupa.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/75526341147.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/fabazijuzebepevumeravoja.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a7808178---xakali.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/bototodul.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/vokedawofagavogusovalom.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/28474898554.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/oq2gs1thapnmjdro3jg4dbep70/zawepijot.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/lovevufixarowojerujele.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/75608621763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=berserk+manga+tome+1+pdfPDF 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_off0000e7b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B3 10900 bytes
SHA-256: 30aa31be12b7f571d42adb9aa2a36a30beacfe03f94a4afb6d8a2f9c0a695d59
font_01_sfnt_off000100d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E6 21700 bytes
SHA-256: fd284cff7bc733d9d3cf9224f69df60bc18a72eae4f1cc2e239fbdbe569bfbef