Malicious PDF — malware analysis report

Static analysis result for SHA-256 acd4afc14244a405…

MALICIOUS

PDF

94.8 KB Created: 2021-06-21 00:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 756d453215f6e404ad9a2b161bef83a3 SHA-1: 72ce2ab6d9c62fa7a9319ef26520d68fac632792 SHA-256: acd4afc14244a4054545b30aeb4254713929a1bc088c28f499178ab43b293120
176 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be a garbled attempt to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://bjallstar.com/upload/file/28251945248.pdf In PDF document text
    • http://sgd42.ru/userfiles/file/57820463215.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160985d7561195---zoguwizuvudidujone.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e12d4eb89---fodezopodojerovakoxamil.pdfPDF link annotation
    • http://munsusa.org/userfiles/file/20210516152749.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920fe490cd2---26565238876.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/41774335731.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/m5e1u6l6feodcl4p5s77d2cri7/86975708430.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/83778072903.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608bbf05664b2---xifuvuduvafi.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b6c4c182---95976636411.pdfIn PDF document text
    • https://incasur.org/temp//files/83810211386.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/b6be2bf645f0895ed2ad2add5641d591/voxeviwatagab.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/moxisitizulebeba.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/dubasizitoborezisalemikaj.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/49192406937.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16e44deeb---67779375051.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=iqbal+shikwa+jawab+e+shikwa+pdfPDF 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
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00014033.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14033 25736 bytes
SHA-256: 539b13740835971a0fa52865a60a8edb48e36d6e27fe7ad258d20316695f6bd2
font_00_sfnt_off0000f8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C3 5468 bytes
SHA-256: 1f4401dbd592576b49411844ef33ec97794bec893013356bbaedea30f2ad6b38
font_01_sfnt_off00010b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6A 4544 bytes
SHA-256: 78ebebaf4abbecbfcec7e6a900146d9d3a35391421c3c9091686cad1763e31f3
font_02_sfnt_off00011a0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0B 11280 bytes
SHA-256: 98e5f73a2e6785646639d4d24dcc0aeaea3c8201e8716a11ac2e8abae44e8d10

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