Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b0be01d3aa1e7c…

MALICIOUS

PDF

95.1 KB Created: 2021-06-30 15:51:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 2582203108e894780bb80d1a4f7dbb7d SHA-1: 3adbcbde54877f1b391ee4535668ead6eaf449d9 SHA-256: 63b0be01d3aa1e7ccd2a685000b14a396456b526db3ac8fba05d0f0fc7b5ec07
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to PDF files hosted on various domains, some of which appear to be compromised CMS uploads. The presence of multiple PDF link farm heuristics suggests a coordinated effort to distribute content or manipulate search engine results. While no scripts were extracted, the overall structure and URL patterns are indicative of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/ba180d815234c7601c3c6ba38e7ff04b/7102026881.pdf In PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079522a9f72d---80527704248.pdfIn PDF document text
    • http://domainecomps.com/documents/files/vunodatabigevifirisidixaf.pdfIn PDF document text
    • http://guilfordvikingsclassof81.com/clients/4/47/479b0a304b4cdce99dfe3eda73a59016/File/41387629825.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/37301001663.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0b17165614f3e1576cfbc52c877e20cf/108504023.pdfIn PDF document text
    • http://eortak.com/img/fck_temp/file/sugasodobumoxabubov.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d214629e2---vuvamarilerajizixadosi.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/20216291659323045.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607696f54c6e9---68175323263.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e80fcb86960823900b7d8506e3c4a552/vipaxemofozabuv.pdfIn PDF document text
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/3lv0te6ikf8u1kk35pgs6ui9l4/10585138089.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/7990751d77deec7b242b8e221e41aca3/jujuluvuba.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/47402996960.pdfIn PDF document text
    • http://filatelianumismaticaumbra.it/userfiles/file/wunogiroza.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/qkh6at942ohmseldhirk6a6u3c/medekule.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/235884572.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9324243ecc3b936e93834fc615f37df7/feremaluresoweliduze.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cc9d31b224d---debexotefodib.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/kedewodedufegi.pdfIn PDF document text
    • http://polyalpan.hu/_user/file/sotikosedobadixetozof.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d294ee2970c---piwutezaka.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750b8816605---pexuwo.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/lutotezijexubimexa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/34363864627.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bsc+3rd+year+chemistry+book+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_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 17456 bytes
SHA-256: 4beff3293304b1a377a805eaeed8305922cbc0ffc1eefd269928eecf711c36a0
font_01_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 11308 bytes
SHA-256: 19575bb792db97c6d928f290cc81755a3fed7f03ff7a6324bb6144b9f1a6b68d
font_02_sfnt_off00015706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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