Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b7f261ecc5bf9f…

MALICIOUS

PDF

75.7 KB Created: 2021-09-06 22:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d19c43c941d7df138edb2f2c0a0cc9d SHA-1: 4a443ea4acb2537d6c7ee0ecb7d5319ca20b927e SHA-256: 73b7f261ecc5bf9f8e62972bbd5ea8e660ea1901455c0d8e88462f7ad3b2ff6f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites hosting further malicious PDF files. The primary goal appears to be directing users to these compromised sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b5d8602cdb5259eb51c02ba6c867f6cb/sasulatu.pdf In PDF document text
    • https://egokituz.org/files/galeria/files/wekakesajik.pdfIn PDF document text
    • https://limpiezasinasel.com/userfiles/files/koxude.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/3c407339e7d0bc728c9f5805f3f8a49a/83224516868.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/34412634688.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bd37523e89---92771845425.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/v0fvo83oio7nf8nn825bp6lon1/9480457395.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b8b7e92d06f083dedae1ebf61e1a7b38/79640522689.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/paxigidebavutogukofefoje.pdfIn PDF document text
    • https://isleo.com/i_photos/file/fugoboli.pdfIn PDF document text
    • http://baove24h.info/upload/files/pejusinazidofifekuka.pdfIn PDF document text
    • http://boxethai38.comupload/file/dadopi.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/xafud.pdfIn PDF document text
    • https://momsgardenfoods.com/ckfinder/userfiles/files/wokakuliwemafiwape.pdfIn PDF document text
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11954011987.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/9b9e81bq7bcdqjgaiuiuibuve5/53846747730.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/pipepiv.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60d295803---68292513168.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/fasomoboz.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8077b9df1d---38156009574.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160967a30b7680---betunosukivetedajeb.pdfIn PDF document text
    • http://gesundezellen.com/neu/userfiles/file/wafedirapimuzujuzuwikel.pdfIn PDF document text
    • http://abpaluso.com/upload/file/sulofuvelo.pdfIn PDF document text
    • http://greenbrier101.com/userimages/1497695191.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/3ba13cb3286b1d2ef1d857763357c975/93641618678.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/85fee1995a5be61db2892b19a928c55a/bebixadokirozakelinogetew.pdfIn PDF document text
    • https://aymexco.eu/ckfinder/userfiles/files/58417514561.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=basketball+uniform+design+2018+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_off0000c1d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 17116 bytes
SHA-256: df7b1b3fbf178da9b3770825acd6727c98d718f1f01c7762e9fee42029e46324
font_02_sfnt_off000105a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A2 11728 bytes
SHA-256: 2d9a3d2fe8ea5ea3f1e5db4286ded854c544945a5460b21de3557f56a3bfc936

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