Malicious PDF — malware analysis report

Static analysis result for SHA-256 d717fb0471f00b79…

MALICIOUS

PDF

74.9 KB Created: 2021-09-01 12:03:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: af794aced0387846c2d3e9f1e0acd390 SHA-1: 142a2c20a6eba07f91362826c4474c9f98c6559a SHA-256: d717fb0471f00b79ab2f6c1aeecc98390dc2516ed572e908631740bc56c780e5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://longarmquiltacademy.net/fckeditor/userfiles/file/tuberojejuboditizeba.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/kjfjn4at7v0p7lihkcpoiion8h/41581369871.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30ba2bfeb---51191885686.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088584d6e78d---raratepedidotisevujema.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/lorax.pdfIn PDF document text
    • https://bandotrading.com/uploads/file/92508548750.pdfIn PDF document text
    • http://toonesk.com/upload/gemisirupepadevomusa.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/65318ebca1cbb752bb8e906126b5bcdf/lemoruselabudipemuli.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/g021cnv1ur9tveur4df8g3mnt2/87913648119.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1c21d3b6c9---43256908715.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/20925244515.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/8ce80c95d0feb70f7271adc989d72f24/25027314409.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/62228527677.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/ledulamudu.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/77212770919.pdfIn PDF document text
    • http://stroi-sistema.ru/img/96505804467.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/dudizapikijenavuxese.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/85596683106.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/18461407473.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/cfb37ae462e14e01439d59d739534a99/15243777394.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/sijemepu.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/gazuwibowazekur.pdfIn PDF document text
    • https://anup.bo/images/files/kimewotumebowufadifisid.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160869a7d65d65---31770567475.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=determine+the+number+of+zeros+of+the+polynomial+function+calculatorPDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000daee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAEE 15596 bytes
SHA-256: 7f330a2b2b9872b2bf0483634832764f692363ae85e37199c636139d596c8e57
font_02_sfnt_off000102c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C1 11160 bytes
SHA-256: 8d4dda0e5150958a11e52aa4178ae97f3c7ae0d8a161ec1db4423df81b98e354