Malicious PDF — malware analysis report

Static analysis result for SHA-256 311a6c614f42b500…

MALICIOUS

PDF

133.2 KB Created: 2021-08-07 16:15:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1da04f63cb3ca3f66bc1fd70786d6ec0 SHA-1: ef25ad17fccd8a6aa1d8407da39f4a0138db0c69 SHA-256: 311a6c614f42b500e4601ac68396767f28bc3bcadd5ed4f3adae87af73394f47
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded JavaScript points to potential exploitation or redirection capabilities within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=casi+todos+los+elementos+que+se+encuentran+en+la+naturaleza PDF link annotation
    • http://covinahigh1980.com/clients/1/14/147ee80f0cf2e08ca1b5067d21485a43/File/sijosikule.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0038dae097---1684209902.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/befixonopetometogelek.pdfIn PDF document text
    • http://sam-global.info/files/file/guxaxanevarokulobevanijij.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6cbba5483---20119168559.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ff3826d26---wadifonuvekovujoduso.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/ranawifugakapakugovamur.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/gudetixuzupebit.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/santgehjobjs48vkopu819dpeo/67351694332.pdfIn PDF document text
    • http://dogable.de/userfiles/file/totariwojomuziru.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202107230233277150.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/86580443659.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/46239720930.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608402ad787e3---jomogopo.pdfIn PDF document text
    • http://zonweringbelgie.be/ckfinder/userfiles/files/66856854472.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb7497a6721---penidabebas.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608045da8bca8---vugetijedejesagisetex.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9cda51767---48867371775.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef275ede72---72255721846.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8bc7b2391---xekilojosugil.pdfIn PDF document text
    • http://izumrud38.com/ckfinder/userfiles/files/27103507209.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/66683724151.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210619234323442.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/a1178aa53ea28f96e72c3839507a6b55/69727066480.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_off0001a08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A08D 10868 bytes
SHA-256: aca71cd90a7a2055df174336e328c8a020076618613378f07f56cb7019fbac33
font_01_sfnt_off0001b97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B97A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001d18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D18C 19596 bytes
SHA-256: 81aecbe0ca3cf55b67e39a335f17585a0131bc63635ebe843732d90cf03dc0f9

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