Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6f318c5591eff69…

MALICIOUS

PDF

97.7 KB Created: 2021-09-05 00:46:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0ec86e7708cea0f0ca4f858cd6fa8e8f SHA-1: 8980639e4d242fa4ff783905b34c49f8b9e510ff SHA-256: a6f318c5591eff690ab3d0e019e59c49ac5ccd6e6a2280d2d40bd7b8ccf97e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, containing numerous URLs that redirect to external sites, some hosted on compromised WordPress installations. The presence of external URIs and link farm characteristics suggests an attempt to lure users to malicious destinations, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://cructi.ru/uplcv?utm_term=christology+of+matthew+pdf PDF link annotation
    • https://szabobuszberles.hu/files/files/74908471030.pdfIn PDF document text
    • http://sitepride.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/retine.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8c5afc66fb13a953b14b2e018dcef11e/62877443470.pdfIn PDF document text
    • http://tara77.com/clients/46590/File/96888030155.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pegomajonug.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/babinukawikezegawi.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160ee705642800---juvinegikesonalorofiwugub.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309dbd99d5---zofigiva.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073dac5a061e---67839750530.pdfIn PDF document text
    • http://luatsuphutho.com/upload/ck/files/85407378049.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9455cce242---11523204693.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/17552946509.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160731e1e91a78---fuxogudisidu.pdfIn PDF document text
    • https://ortechindustries.ca/ci/userfiles/files/20003331168.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/13804352973.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/mamoxajazisunu.pdfIn PDF document text
    • http://builderall.info/userfiles/file/kibuvuvirukor.pdfIn PDF document text
    • http://rayanchem.com/d/files/40006717894.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/mosemelugi.pdfIn PDF document text
    • http://tnslib.su/userfiles/files/besab.pdfIn PDF document text
    • http://dlt-nkp.com/fileupload//file/sewozenavifiguvi.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef72faa597---najijipedix.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/14254517479.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/96109079078.pdfIn PDF document text
    • http://dohertylaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kirufafekutezurirovanojud.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_off0001167d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167D 18740 bytes
SHA-256: dff5586762a456c2deaf29c227a403b711e4dc99a14fb2d7e661a8e7d79aa448
font_01_sfnt_off0001470a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1470A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F21 11072 bytes
SHA-256: 9cf68e65b8e7fce8194f5988cec7248f387bc1025142d11cc80024cafa036d6c

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