Malicious PDF — malware analysis report

Static analysis result for SHA-256 c125ac009bfd874a…

MALICIOUS

PDF

98.8 KB Created: 2021-08-14 23:24:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 32260c7c39dc31a52ca9151b9a25ea9f SHA-1: 6dcfb11cd0cfabfc0ae09b6700a264da297f51a5 SHA-256: c125ac009bfd874ada430fd622e49862f49bdfece7d31a0c70c55eafd0130878
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://synerhu.ru/uplcv?utm_term=what+is+emotional+relationship+in+personal+development PDF link annotation
    • http://adamlegal.com/userfiles/file/94841288196.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/923ab13c9cf22d1a6e789f96c2927de6/46458201511.pdfIn PDF document text
    • https://eliteplacementagency.com/uploads/files/kisutezirugivameg.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/83370974450.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/f774f552e149211195caefcc43d3fe76/72231487706.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6343e6ce6---5712404430.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/pusenanufojipovumofovured.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16104c8eaf039b---33420849806.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098624d11f24---xarul.pdfIn PDF document text
    • https://legyenegyjonapod.hu/userfiles/files/73642426182.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/91816515272.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b077c207fd5---7855125107.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4a39720f40dce4f31160c8cba876f380/67208852983.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/912f2879bf682518095c5c25284285a6/19040302473.pdfIn PDF document text
    • https://t2sc.me/userfiles/17530798603.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160e61ad852853---sizupobovugulube.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/bcdb95921cb49839153ad4e20b07a214/18668893327.pdfIn PDF document text
    • https://cavalier-king-charles-spaniel.ch/userfiles/file/japugu.pdfIn PDF document text
    • http://taborcapitalpayment.com/clients/d/d0/d0a3925ee25d0adc8806453b18bccccc/File/13129984721.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d4cbb5ad70b---tolilitobaf.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/sesebijizagudemepuvuliva.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/85203183488.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/051903286103.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/56647637655.pdfIn PDF document text
    • 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_off00011da8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA8 10716 bytes
SHA-256: 80ef40314478a03bf4d2a0aedf7fe9bd6578d346b2f59538f71424c7e5b26cec
font_01_sfnt_off0001360f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1360F 17488 bytes
SHA-256: 2af512d2166d55722b538588b9279bd5bcdcaaf9a6a229aab50d2b20b409f4cb
font_02_sfnt_off00016378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16378 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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