Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c56de02c13d263f…

MALICIOUS

PDF

84.3 KB Created: 2021-10-15 13:10:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2b7afa9891bca2e9703817259883d783 SHA-1: 23bf4154439eaa6bd09a3431887f19e3e020314a SHA-256: 5c56de02c13d263fc249c15a2b3e97ccba62b49a32ed79832c4237a835bebda4
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to multiple distinct hosts, including compromised CMS upload storage, suggests an attempt to obscure the final destination and evade detection. The heuristic 'SE_DOWNLOAD_BUTTON' further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://scalper.ir/data/files/file/77226808736.pdf In PDF document text
    • http://extintoresorigen.com/images/editor/sazuxoda.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/27146397463.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/tekafugogadomasexotivinam.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/31396450060.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/jekegagi.pdfIn PDF document text
    • https://crmsaas.dswip.com/ci/userfiles/files/dobewipaparub.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/73964854737.pdfIn PDF document text
    • http://agriturismolescuderie.eu/userfiles/files/90856948812.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/77703496104.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1615fe032bcba8---xerojagipimibaxupakuruse.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/subemewuni.pdfIn PDF document text
    • https://tigapilar.com/upload/files/rakivukizaferefilebi.pdfIn PDF document text
    • https://salwangurugram.com/files/14472681115.pdfIn PDF document text
    • https://denis-lefebvre-services.com/fichiers/file/jalaxavotujesijiro.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/lomodopuri.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/66718145574.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/mujimelus.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161457ce7d03---8735976811.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210914192039.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615bbe52ef9c1---kanagakilivakefirotamol.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/pivetuk.pdfIn PDF document text
    • https://receptabc.hu/images_banner/files/2218295360.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-23/images/files/51117018971.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161671963a08eb---85946217832.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/49246196071.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/oscUj7J0Gjw/uplcv?utm_term=fifty+shades+darker+full+movie+download+in+tamil+dubbedPDF 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_off0000e114.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE114 18172 bytes
SHA-256: a7223787dddd396ba0daf1ee16f1b3087152b2b4cc248a659e9a277d94bba393
font_01_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001285d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1285D 11196 bytes
SHA-256: db5a1c699f0257ce3dc93310672fa2016576ce00216318b51dcaab0c404dd0fd

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