Malicious PDF — malware analysis report

Static analysis result for SHA-256 785b1872927b759d…

MALICIOUS

PDF

88.3 KB Created: 2021-09-04 02:05:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3870b756092148ccdac59c075efced6 SHA-1: bef15023426b67298919edab90a3e8b546e03ec6 SHA-256: 785b1872927b759d389fe5c2cd62485df9709a4ca17b06d157a6fdc465998e73
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm behavior are consistent with techniques used to deliver second-stage payloads or redirect to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=arquitectura+gotica+resumen+pdf PDF link annotation
    • http://imhkayseri.com/resimler/files/losowojapevazomajaned.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/zugozeximepixa.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/3e98333f9f281c5d76f33cf72e9cde34/59694236576.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/97435685427.pdfIn PDF document text
    • http://klhl.com/userfiles/file/88010103928.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/ketalagelemogoguladipot.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/73774346366.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/15a514cea1570fbefe94e5813272ab7b/venaludapijixet.pdfIn PDF document text
    • http://hanboo.cn/Uploads/file/2021053121004270554.pdfIn PDF document text
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/s17veplla95i2p8p3rsa3hrh8i/selulazefibeluvofo.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/d9ac77387a36dbe04729cc8b5d9a3bea/83099083991.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1007bff2---gixamopireliribu.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ingj8pshfudthvgf5oibbscgt2/xiwuferawaluxetorupit.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084f396da49a---53282900075.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/zeduguboxusegejuroxe.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/1140r49bcbadm0psp5gjmgajos/78034423072.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles//file/geniwutavuzanawuzadusuv.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4cc8cb78bf---7878271558.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/80nuh52j4a3k70iq914qk1a6db/30576234018.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/befetejurojavorefimexezu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/3433897096.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/53616197267.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/940fb15d4de7f33c5fd78f11d3dea58c/14377654942.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 11144 bytes
SHA-256: 56c3f704518e0722a37cdb8ab02bb66621bf8ab29a5adc12935fbbf82c8c22a7
font_01_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 20100 bytes
SHA-256: 2ee0767982d30f031d177a4cb89e04662ffc6367b06073f02303f9b4a8a390bf
font_02_sfnt_off00013b40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.