Malicious PDF — malware analysis report

Static analysis result for SHA-256 844d5a468294db49…

MALICIOUS

PDF

80.4 KB Created: 2021-09-19 23:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bd9f9e69be56da60de0e23c88ee607b9 SHA-1: 0bc8b442962b8933b4cb3809630ff77aa4074a93 SHA-256: 844d5a468294db49dde341be56f6ba246536f2be84d01a758eb092ca7bce3666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://manhalhealing.com/userfiles/file/diborabenoberevisudubej.pdf In PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/sijalugemezorisudamev.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/41059295180.pdfIn PDF document text
    • http://goldmustang.ru/files/files/telepalufelokizo.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16144a35ee761f---51945936430.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202193194699482.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/wawolawesex.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/bixivapedobudade.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/66552351307.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411b6951f6d---mukesinorili.pdfIn PDF document text
    • http://namngonviet.com/user-/files/76431990807.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/toxolipumowogiwokuz.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/sixofimaziresasolipuboguz.pdfIn PDF document text
    • https://magnanerie-cazilhac.com/userfiles/file/72591687402.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/10924560500.pdfIn PDF document text
    • https://kompaspt2.com/contents/files/sosutesedelomutupax.pdfIn PDF document text
    • http://alcantara.cz/data/file/wegimoxatoletedab.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/60057563470.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210907_53DF46AD5BD6C487.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161461e507f19d---setileme.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/47cd6f5fbc82dbba68a966d3d7ba018f/60587096405.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/bawomiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=galaxy+store+not+updating+appsPDF 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_off0000d5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5BC 17324 bytes
SHA-256: 015593471110c87156801a1f531bc6b780961b39c908cf7045151b6d5a6b7065
font_01_sfnt_off000102da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DA 10924 bytes
SHA-256: 65c96587fdc647fd7f127e96e99e6ab466915bdc794a37fac31a4b50e98f5036
font_02_sfnt_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1