Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d26275d914f13fa…

MALICIOUS

PDF

121.2 KB Created: 2021-07-01 20:47:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b96b887ccc1cabda11a11a0b32805a96 SHA-1: b30631311b8d1adb0f7424a1a665212fd76840a8 SHA-256: 0d26275d914f13fada48606b25cdd5c991edd422a5ae0bb14e9ec0da57e4e84b
156 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. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a distribution mechanism for further malicious content or phishing attempts, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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.
  • 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://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/7bafe199b2f6f151e445f320bbc0c5d3/3059086323.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160989a15e1e8b---tumuboputajo.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160cb89f13d828---64847644504.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948406bbbda---25199594185.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/999dda9cdfa0d69abdaf8a64bbda7119/97761281303.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/82155960738.pdfIn PDF document text
    • http://www.sudaff.com/pics/file/81157983415.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/it7kn67vagr4v1hv1icjrav1of/21990023620.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/77893535c3eeb8b10374ed9ca432b18e/74970609310.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/71e2d3fef50cd8957652f536f28f8916/pujulidosezasufolarot.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/98829012148.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/vizugevonipawi.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/zopuburudapemukaxoxugiw.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210624_035625.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160758596689c1---26522587215.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/f8c51205d3ba988bfc7b281a2be15545/27158664553.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608646042fd46---49272427306.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdfc34ea98---49369870725.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b08f221126b---64683343282.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a90eae057be---6114983649.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/692495147.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b0993838f---73031585192.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/9d2766b6b5ff8b80fd6f1366c1249162/4734486273.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/345067915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=cure+serious+wounds+potion+pathfinderPDF 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_off000174c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CD8 18316 bytes
SHA-256: 380bd0157c9976ea991ea42bf7fccc70f7c61d787b0ffd1977d47f71684c49de
font_02_sfnt_off0001bcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCF3 10764 bytes
SHA-256: bcd82f15a58aef000c9bfc0db2c49293d0beafd6811d9d74dacb0af074d6d4ed

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