Malicious PDF — malware analysis report

Static analysis result for SHA-256 1744529651d02f3b…

MALICIOUS

PDF

88.1 KB Created: 2021-06-25 17:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b978e605be53b1e72535a701126813c SHA-1: 18e071ef7d8bd13ce340632a0cea42334ddf1d04 SHA-256: 1744529651d02f3babdb050b3eeea9cbb7211d3c0aecce46228135d63665a0e9
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous embedded URIs that point to compromised WordPress upload directories and other disposable hosting sites. These links likely lead to phishing pages or further malware downloads, aligning with the 'Spearphishing Attachment' and 'Exploitation for Client Execution' MITRE ATT&CK techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://cructi.ru/uplcv?utm_term=madagascar+and+the+indian+ocean+islands
    • http://d4sontario.ca/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/dadezulosebukinas.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607666f162da1---wewepibutunudatepegomav.pdf
    • http://hubbardfamilycircle.com/clients/62940/File/guvupesumidinisel.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16079998ec205b---gutomokijokedeziju.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862374539c1---wagivoj.pdf
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/2967ef04a626db2a176b338ebd7b5254/78548339046.pdf
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9af7fe828a---goxibumom.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/3b09ad97cdbc3943a350b74bc7fbaf6c/zipafulaxoxevuzaj.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/3a2093652aa0aa5a39da20917dc08f33/xavajatakefexutefi.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501103201987296.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b59ce069dd1---tefidaxox.pdf
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc98f078df---18676485911.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07ff0dcc0---vijozuwiwi.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084003f4f154---80870689348.pdf
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/bbg0nhci6utht436198ms25op0/51291847837.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-6-1/20210601202414217408.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b91dc1574---timodopuvufukanetumu.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/e4b6538c6e352ba7924515d189d194be/vuwusoxeponoxevaxe.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/bfbf1c02ac9be7937c9e6247f7307c35/45464425546.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/6a9s739l6omdph9tm2kdqk5lt3/90662363542.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/f258937e47560d2017fc30735bbdd53d/musiparetemamukitikuxo.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609f84b45565b---49848542732.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607c867fa090d---pekubodawabemejaba.pdf
    • http://geologocarmignani.com/userfiles/files/24127413842.pdf
    • 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_off0000f1c9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C9 16792 bytes
font_01_sfnt_off000109e0.bin
a09dabb5397fbdc854048489da933a88899c4d47f86c7350a39df5d6cb0cee27		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109E0 10644 bytes
font_02_sfnt_off000121ed.bin
801fba50ecb54121802650513a7d987605a07f15feaecfed562a5fd2fb4eb1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121ED 17996 bytes

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