Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdcb7b5d839998e4…

MALICIOUS

PDF

95.3 KB Created: 2021-09-07 12:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e4f385dd15e4e7514fc45a82c57f216e SHA-1: 41c44b2af22b03e2c6f95822038b58df3aa1df1e SHA-256: fdcb7b5d839998e48df3be5fcfab2ee67854f2e0343bba8bdb863beab1a195c8
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many hosted on compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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 http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/gutepuropigerebitokukiri.pdf In PDF document text
    • http://gsemilia.it/userfiles/files/82428671564.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/30310188243.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/zudoledetusadawixajap.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210606081159.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/42799555632.pdfIn PDF document text
    • https://produse-zilan.ro/files/11865938727.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6a232a5f---60147317486.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f172837d4b098a5d25fe2f8b73f52bd4/7408809241.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/9c81f9aaa259edfd2c7815939317331f/34015336904.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/2549997478.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce4e8e69da---74830497973.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/33492009415.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/77626933762.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/fanekorejipopesujekoxa.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/27315430802.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/38229765514.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/05d956a90cbbbbb72ea5098c9b12c1b0/26311531067.pdfIn PDF document text
    • http://capital96.com/userfiles/file/roxukoxigulotesekiwiwov.pdfIn PDF document text
    • http://alkanboya.com/files/file///50444353315.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/93717336655.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a56ff1ea712667e077459a582778ed88/57712612566.pdfIn PDF document text
    • https://hijaustabilo.com/contents//files/65312076152.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=tcl+roku+tv+manual+updatePDF 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_off00010ee1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE1 10636 bytes
SHA-256: 2229aca64f6c9f5b70c766911e4d6700e3320479bc04dbcb0d0d9a3cf7f3c750
font_01_sfnt_off00012746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F58 18700 bytes
SHA-256: f737b30abc91be629475558871e563db44891c969b8535f90b6108126f38da2c

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