Malicious PDF — malware analysis report

Static analysis result for SHA-256 78588491b7e9f3ef…

MALICIOUS

PDF

180.0 KB Created: 2021-07-21 23:34:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6827f58bb98fbe643fbb1c8b81bf6d0e SHA-1: c5510fd047e3dd8fb3a247bdcc0d2cb9d3325fca SHA-256: 78588491b7e9f3ef3a87993a6279ceaedd03e6edc36f0a5afc32fd0b36a8e515
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9712

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 http://technoauto.jp/js/upload/files/53684565566.pdf In PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a33p8dgcd20bs0bcg1hfeu93k3/71697145181.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dd203b5acab20359b4d55f7f3c04d587/280458624.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c741225c7ef---80154559840.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/0muf95o9o1m1q27d7ecaf8af91/tetemudiziselalalisijuzof.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/ruxujukulukeririzipawilek.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dd37d05d2---73085926715.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0aa0045d---bozase.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/fatimeweno.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/2461277526.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ca0be8b23---43129236224.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160946aed35e3a---28147351309.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/66206810938.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0i25sqfl9jnglkltvjvpoikg04/zekapidoragukogigibej.pdfIn PDF document text
    • https://virker-ikke.dk/files/gipejosidogaxogikakam.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ef53a9ff9eed0fb6c0a19a3969f6907d/befesisakovupoku.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc90cb428fd---41560631997.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/dipefed.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/1a4egqsq5tfbuq9de9uh8vnigd/gofulopalixo.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/87fecee4e6806174b2f7043658213670/gaguxekutogivadiw.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/67cd4d255e34d79e248e86caa40437f4/jomunasutapavedaguf.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/d4a4e52602e5451405923296de1da32b/xemevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=fornication+and+adultery+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00023c4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x23C4E 17508 bytes
SHA-256: 910ea12ac5f8d762697150a38ceb5bfc6100947126cfcf33f04cbf203f99382f
font_01_sfnt_off0002573c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2573C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26F53 10736 bytes
SHA-256: a1dc60af864042538d672e215eebc3fdd5ecb2df281a0a14be64a8f44d2cbb3f
font_03_sfnt_off000287c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x287C4 21344 bytes
SHA-256: f9c21d0e96589055f5ef9b75c0a0e12150b51883e724eec9d1d3c8f11ee77496

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