Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d8bb683e371b756…

MALICIOUS

PDF

83.4 KB Created: 2021-09-05 15:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fbc9898c4818fba8a79726409729a2b4 SHA-1: a60e4b47c6db5d357f17e23aafeef51910f94c76 SHA-256: 2d8bb683e371b7564275696329367f9c65ab0a04f99319619b7738e8684746d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The document contains numerous embedded URLs that form a link farm, directing users to potentially compromised WordPress upload storage and other disposable hosting sites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=awards+2018+current+affairs+pdf PDF link annotation
    • https://abcoegypt.com/userfiles/files/pogufeluxusujo.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160de4cce420a2---31670593890.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/59178552184.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1612460ce8c668---xawulimer.pdfIn PDF document text
    • http://fructusartis.com/i/File/fonoreluruxijepulaled.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/jumekutulen.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbffba8626---37864576065.pdfIn PDF document text
    • http://cosmoscm.com/contents//files/sikabonamirolasodavimiki.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20215272356555201.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/crbt2mn5j7d4ms4but1du354qd/88900395455.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/44722546106.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/tp5an79bik1rs9n14s0drg23mg/42272456459.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/mamenawufedosafo.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/rokegof.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16121cf2388f19---fujipudemuwufigametuwu.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f03a50d2e6---67673984984.pdfIn PDF document text
    • http://geasit.it/userfiles/files/51184928280.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/pokixesobega.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/15915338492.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/xupibotazagowati.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a027fc42b68---79906212159.pdfIn PDF document text
    • https://hostingalani.com/calisma2/files/uploads/47551802351.pdfIn PDF document text
    • http://runo34.ru/attachments/file/19036021344.pdfIn PDF document text
    • http://dahchen.tw/userfiles/file/84973310668.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_off0000df4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF761 11116 bytes
SHA-256: 7d99450863ea199e4cb36517ff6212e82201e7efc82eadd14215df0e3e79ab12
font_02_sfnt_off000111a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111A4 17984 bytes
SHA-256: b452b2b0185612b5c66a7050b8562135e585dcc09b4d76313df4ea347d33c0db

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