Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd73eac4ad9d0373…

MALICIOUS

PDF

110.4 KB Created: 2021-09-01 12:56:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ab5f77b8cd43bf5e0eb7e30c9e8af51b SHA-1: 8f61a48091d3142f3c19ed86723ef0a41aa02327 SHA-256: dd73eac4ad9d03733677d40885cbaa1f4038959812e2ceba255cbbf975ab0452
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites and utilize link farm techniques. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic firings and numerous external links are sufficient evidence of a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd6bd67c17a---bikilugizusukan.pdf In PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16092554080dad---fuvin.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/95916003528.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/joworunal.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/rupufezelofevojebo.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/mexetezox.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/0bde96d7970f6d5b7b7dae062d141b20/47280434819.pdfIn PDF document text
    • http://grandinspirations.com/clients/75274/File/38606383558.pdfIn PDF document text
    • https://jin-ji.com/upload/files/18102800185.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/gefopuv.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/7419137140.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name//files/33738429820.pdfIn PDF document text
    • http://rayocazar.com/images/elfinder-1.1/files/file/15638985648.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/gakufozenosupalizakagubu.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c494b1253d---20347816053.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/vp0kfs7npqrt55rin1pgereino/89174847270.pdfIn PDF document text
    • http://mhs69indians.com/clients/864804/File/zizev.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/11079279647.pdfIn PDF document text
    • https://activepymes.com/pub/file/98687805282.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/28327cc74001a15a228dcb760f38e45f/66682960168.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/41734035816.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/lonatubirumuxudadixaxuput.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/c246ebcc99f8d17b9bbea8953330c03d/43666371361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=crowning+of+headPDF 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_off00014be4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BE4 18560 bytes
SHA-256: b9ea491c41bf517151b07c101e6e3c3a6f124280553829b019c653195ca7474d
font_01_sfnt_off00017b84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B84 10440 bytes
SHA-256: d440be2a278a23cc0a50fac1ff52b884f13b7b1052c4235fa6e7dfd261646681
font_02_sfnt_off000192f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x192F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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