Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1258892bd77a586…

MALICIOUS

PDF

97.7 KB Created: 2021-06-28 13:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2654abed6c70723d3a963a9c9102d656 SHA-1: 3aed55d8a964301a8facdb41586ad7e1a0a69182 SHA-256: b1258892bd77a586586b8fca5169e0cfa8eb93aa8217d48b5b358395d885face
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites, specifically within form upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of link farms on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9802

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://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed0f81521f---64906429035.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/rinifuse.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d2f8726aa---56014195954.pdf
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/60a5394d91ed2c68c8c2b0bb8324f26d/10606520414.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c88c10afa3---98408837961.pdf
    • http://anaminfo.com/attachfile/file/xobofuwux.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/m3esovp7nn55lanq76ftqt87k1/40177455890.pdf
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdea949964---figusotomedubo.pdf
    • https://callmarkinvestments.com/callmark/files/77933689679.pdf
    • http://carsongrad75.com/clients/3/35/35717660c32d3dd9b0ffde8f33a19d23/File/dozizovojija.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/6a7e8b3fe52acf3858c589383135146a/sonabexerazesigod.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/ucbhoa62buqmfrttopuee6i069/31414031703.pdf
    • https://istocdukkan.com/userfiles/files/fomulidogudasunivif.pdf
    • http://dragonera.cn/admin/userfiles/file/jalatu.pdf
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/60fd064b6125c8da0e9c59d5c450a1b7/jigejaj.pdf
    • http://sam-global.info/files/file/38888639839.pdf
    • https://alshamiltrading.com/alshamilfiles/file/10256017101.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/9gn36v103pc07fmdteucjkb942/rakamobivupolexumavitu.pdf
    • http://castudio.eu/userfiles/files/xitamifomasabelanapuv.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/084f6cde8e045a7731aa9ca8aa913989/walofifobesesup.pdf
    • http://change4best.ru/upload/file/kedowofapefalabop.pdf
    • http://files.ibiza-ferien.de/file/18630089030.pdf
    • http://conblocmanado.com/pics/file/58957272547.pdf
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/df8acdfda83ef8ccbd17b0e1f1b16f51/39125393719.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/rm7juao1eevg1avg8kr5bh0l12/33980506980.pdf
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/2cb86b76fbbeb7b95a3d97378ed4895e/jigufimikumobisemure.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092631ce1bad---bopimugusavak.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=abstract+algebra+by+dummit+and+foote+pdf+free+download
    • 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_off00011450.bin
a1cd8b13579a1dd1fdf667d0981f61a9861a2346c1bf3b82bd9a8f41d5454d17
pdf-font-stream PDF embedded font (sfnt) at offset 0x11450 11384 bytes
font_01_sfnt_off00012edf.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDF 16792 bytes
font_02_sfnt_off000146f1.bin
d4b0dc34c6a2b22c58bc1ee896e2f249f142130c6c86f04a55c5ece3b02c3aa3
pdf-font-stream PDF embedded font (sfnt) at offset 0x146F1 18212 bytes