Malicious PDF — malware analysis report

Static analysis result for SHA-256 995dc9caf7b23d6c…

MALICIOUS

PDF

89.7 KB Created: 2021-07-03 23:54:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5dfe4a49cd5c6aa9173dc69b4e7b21c4 SHA-1: 6f9c90ea6afa2c1bbe805e25d33c7bc682cfba95 SHA-256: 995dc9caf7b23d6c0aae1914d1b51a0a191df041668e5d6068f6e9ebeaa4d3a1
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous links pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://auf.vn/wp-content/plugins/super-forms/uploads/php/files/3pp78sb36jq4mv3d9csjtt2qo5/32407234478.pdf In PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3672df840---puwifek.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/vumupadu.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/36257724978.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832a818b261---89990508143.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9tg22s0jv16lt6kmot1fthhhu7/98204096792.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/zufesezupo.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/58204423836.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/7f3c82a3bd76457b009d4c08b2ed1e89/redawuziwemivi.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16098444351a5b---33612030455.pdfPDF link annotation
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/59385543951.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160aa34fe091cd---falumamuw.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/funud.pdfIn PDF document text
    • https://adtw1.com/ckfinder/userfiles/files/94361481447.pdfIn PDF document text
    • https://hijaulumut.com/contents//files/33737781412.pdfIn PDF document text
    • http://ecompletecontact.com/ckfinder/userfiles/files/34774428206.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/98bc30cc5822282f4df92548d2958ef7/33478989520.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/7f4e12927734ac6268ac7fdaf002f50a/garozugoxujoseporufotix.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/55992945968.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=miley+cyrus+and+cody+simpsonPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE697 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAE 10784 bytes
SHA-256: 80bd65d095ca526cc8355972f1021097d0dbe54155fff630e890472907eafcd5
font_02_sfnt_off0001177c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177C 17112 bytes
SHA-256: 580d831c84b6243de42c61a4d278afae1b8f0ee3ea93beee36620f9d5d939ff5
font_03_sfnt_off00014417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14417 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467

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