Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4d4773d39928e7f…

MALICIOUS

PDF

81.7 KB Created: 2021-08-16 00:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e2d2c89c5337f1f631c0d255ed1fd08b SHA-1: bb50f58b3295e981407edeee90ec74fa9a43a31f SHA-256: f4d4773d39928e7fe258681f31699cbb55640c8d152c9329e977bbe5e02e3a1c
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, many of which point to compromised WordPress sites or raw IP addresses, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious link farm designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/58mpv5scbk5mfrlmo465lc3fn6/46199712200.pdf In PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/vogenodujodidud.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/51922678653.pdfIn PDF document text
    • http://amdind.com/userfiles/file/26652213554.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f09f9d84c1---69800976981.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/lodigekakejonalipene.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b29a33666---gomegi.pdfPDF link annotation
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/bjeihs3rimpoatpaq8k0n44c70/kusikos.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a2950f405---kujigeropodiw.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075a6c86a452---28073349319.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa6419dbc8---42640695359.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160a2402938003---66726945935.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd37bc27a1---bugenovodolepilefogikam.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/caf2d639db5f28ee619ed56c6e25084a/pitelurusevil.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/paxotomibopuvifidelese.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/1e92fe11ca9b04a7b682491bfe6f1b50/40412456508.pdfIn PDF document text
    • https://ctapigroup3.com/contents//files/fasojenigiwurowogexaxik.pdfIn PDF document text
    • https://impactcleaningserviceskc.com/wp-content/plugins/super-forms/uploads/php/files/1d56473ede8d3f0f753207d438abd33f/81440091581.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/5693923657.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210705161606.pdfIn PDF document text
    • https://hirurgija.me//files/gusiwozuduxukoladazuk.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/48262680267.pdfIn PDF document text
    • http://princeverma.in/uploads/files/weraxu.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/buxupofifivikorafejonub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=angry+birds+star+wars+hack+apk+2019PDF 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_off0000db24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 16612 bytes
SHA-256: dfd66756df8c5d075a10a7e883aebc4b3088e823ae6de7384d90fb1a85a7fbe9
font_02_sfnt_off00011e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E37 11372 bytes
SHA-256: f10f7f905f173dd6fa0fac1d20b6c268bde051869653aacab59143d70c59ba4f

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