Malicious PDF — malware analysis report

Static analysis result for SHA-256 c744b48b3c368d13…

MALICIOUS

PDF

70.0 KB Created: 2021-09-27 19:16:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7413badbef510c48323924d49e3c66d6 SHA-1: d4ec0640da7096bee33f5ecc6735829942a1254e SHA-256: c744b48b3c368d134528ba8f8b9fae7feeb6a6cabc007bbc2fd842398b47a39b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly suggest a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614014f1adaa1---79364256621.pdf In PDF document text
    • https://aprenda-atdi.com/uploads/files/94828137990.pdfIn PDF document text
    • https://interangkorcondominium.com/userfiles/file/51849434267.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/46712765088.pdfIn PDF document text
    • https://jurad.eu/files/file/30362918137.pdfIn PDF document text
    • http://lapempi.nl/ckfinder/userfiles/files/50239383626.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/narasev.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/48523940840.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/4b511d6e54da1d2a902e3f9123c255e8/78076274889.pdfIn PDF document text
    • http://aczelzalog.hu/tmp/jolasewaxabetegujabumop.pdfIn PDF document text
    • http://www.fdconsult.qa/public/uploads/cms_files/14044509066.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/pujujisagevam.pdfIn PDF document text
    • http://asja.ua/userfiles/file/13903225031.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/58166858105.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/23763133575.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/rafojesijuz.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16145453571456---riwazemexatamebavididogin.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/32929512032.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/jarimuritusogafi.pdfIn PDF document text
    • https://cuatudongnhatrang.com/uploads/files/93882330933.pdfIn PDF document text
    • http://tongrentangthai.com/UserFiles/file/14973071933.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/89629b9752a88b5a1b9a36ab89dff618/wedilakuj.pdfIn PDF document text
    • https://alibaba-cave.com/userfiles/file/pipikiregugibapajev.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb043b981d---49416481672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=google+play+store+apk+free+download+latest+versionPDF 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_off0000afa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA8 11072 bytes
SHA-256: addea9244b4218aaae94ee13cacfefdf740e5b2633df1814899a74721a1f28b6
font_01_sfnt_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 15976 bytes
SHA-256: 3d933b483b3be3b92ee8833488f2729dc3ad28e118c8f98b9e8509440880fc67

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