Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f7ade79a0bb68ac…

MALICIOUS

PDF

85.5 KB Created: 2021-09-07 08:18:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a06ec144f0b1e65720bdf0b4bd374cc2 SHA-1: ab3197b58a4653c8e1b5d8bbbfc90968b77faceb SHA-256: 5f7ade79a0bb68ac8db88e4743ba7342b7cfb9f82591dab506df6b6ab557ea9b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://srldirect.com/ckfinder/userfiles/files/riguposu.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/ohj10t464ke75kgg2cf4lm37dv/49646528860.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078575958809---34677526125.pdf
    • http://tythb.cn/uploadfile/files/61456145767.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085205b4d0bb---vimol.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e283faf953---75626469109.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b88c885910---momuxeded.pdf
    • http://murasakijr.com/uploads/files/96006854861.pdf
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/2e6bofvferb7bap75acml9kko1/21987517739.pdf
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8aeddi64efo6rbc18sj3j82g50/lewelij.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160794a7e96ad0---42787193255.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/fvlf1h11o0pqn17h05uu043vr7/25444527196.pdf
    • https://alzubidi.com/userfiles/files/juzatuga.pdf
    • http://essentielles-theater.de/UserFiles/File/titizevenixewo.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c4e410127d8---vivapitasobi.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/99e538d2d90868e27f9d5a81b0943c7f/75717324082.pdf
    • http://liccuza.ro/stiri_files/file/13299543807.pdf
    • http://www.binghan.my/userfiles/file/katisizovibebogoriluj.pdf
    • https://callmarkinvestments.fortunekenya.com/callmark/files/55762072215.pdf
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161054eb00a835---47036154853.pdf
    • https://sunrise-photon.com/upfiles/editor/files/pugafakebuwesadag.pdf
    • http://ndt-tl.ru/upload/file/59021500859.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa09b0438d5---70239885352.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f22521f980---46943629620.pdf
    • https://matharu.ae/userfiles/file/54352960859.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=pigeonhole+principle+proof+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd9.bin
9ef5399b394cf4e4d3a73f8c1bbe435376c5b6a9f8e9a2a02b19c2b8aae42945
pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD9 10472 bytes
font_01_sfnt_off0000f734.bin
23fcf5b55764c87dd63c9026c4e2167c97bccd0b39849f9719333290b866555c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF734 21940 bytes
font_02_sfnt_off00013087.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 16792 bytes