Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb9c088189a74885…

MALICIOUS

PDF

84.6 KB Created: 2021-09-02 13:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7dc529b4a1cbaa792196e437587b9ab9 SHA-1: a3d8eb7e23b9c05a008cf9d1b2d9be9eda005a46 SHA-256: cb9c088189a74885d3d276addb8488de1ce102fae66783e3c39257a33dc5eae3
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to redirect users to malicious sites. Multiple heuristics indicate the PDF is a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to phish or distribute further malware through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdfe1f0887---tuxiremipisadepin.pdf In PDF document text
    • http://autofactory-jin.com/js/upload/files/sekilavolomivumatuvu.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b2957bb644c---72821757239.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//38881927964.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/20e2c9c2e1a5726a14283c58d746129e/zavekixagujifif.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/70580478275.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969b0e51e97---punuxulujisuxatexilexopim.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021071518291875.pdfIn PDF document text
    • http://www.toptehnik.si/images/68164135342.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608515abbeba0---rotumojubuvenin.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210827_CC91762C1719371D.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/3ome5k12k0ec54psbt368b25tk/4123572395.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/60472587345.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160770ddc3df48---1651498137.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/nijexowasudifunageg.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/lanumekut.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/f1abdc5e4eb1317e134a10654dad4b53/44872339419.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609243f7bcbd2---66378224642.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084e774b89---josip.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/67782854961.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/mefarelijexozivanis.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/c6eba2a653b5551a48ffabff6cd05203/35870259998.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b12b6856f57---65771661698.pdfIn PDF document text
    • https://cyklo-wellness-penzion-palice.cz/content/xobunediluvavoxuzu.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/zolegavelologolo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aristotle+politics+book+4+pdfPDF 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_off0000e5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F9 10636 bytes
SHA-256: a0dcb9fe3aeeb04560e01e1c54402f66a016ae1155af62cb54751281a64ae2ae
font_01_sfnt_off0000fe41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11653 18024 bytes
SHA-256: 688d49337e263fbb98342cd24741a40bcfc109aa1c2b7384d101cb470108ce05

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