Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a9a426d6234d8b4…

MALICIOUS

PDF

74.5 KB Created: 2021-07-04 11:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 78680f9b08b8751d7da32fbd38255cfe SHA-1: 92fa8d37a9acbac4ac55850b35b3d12723b53596 SHA-256: 1a9a426d6234d8b4d9aa23c1a4f1407f3b437f230e3ac6f79225f98037e80d15
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various PDF files hosted on different domains, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the overall structure and URL analysis point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://kaptenhoki.net/contents//files/nitafowiwefore.pdf In PDF document text
    • https://avenue102.com/uploads/file/86880138169.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce741719da2---pigujelemiworege.pdfIn PDF document text
    • https://tsegypt.com/file/51053583310.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/74eb36ef50140bc4549dd948132922e1/tanoroki.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/10487000556.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///38250824304.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/tididovemutigowogason.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e16778f8ea---bumudipodu.pdfIn PDF document text
    • http://debden.org/userfiles/file/fumazababodironatelepo.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609473412dc8b---xudabavamamefulavevamibo.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/tobutiniwisidunewerebixax.pdfIn PDF document text
    • https://htapigroup3.com/contents//files/56962965510.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/f142a71aa68c8deefd944f70fa81196a/sazadaka.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/fopalujaridepo.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/76c3cb91f1b53558877adc62eb891954/31330347356.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/jijizimikukuzumuxujar.pdfIn PDF document text
    • https://sambelteri.com/contents//files/9598189576.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/7e2db8ccff95faa1f6901c99caa12849/wixusegezun.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099f0025734b---pubewowimawuxuzuxema.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/16077e8c355961---36109703384.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a365fa581be---taperupigekobuxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=geography+grade+12+mind+the+gapPDF 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_off0000c0c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E0 10952 bytes
SHA-256: 7e2cf2c2b4cd501b9639a09c26ba7c329acf0a56027ce7d42d5027c5725ff440
font_02_sfnt_off0000f202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF202 16636 bytes
SHA-256: 1dfc833262a63de00b638ebe100198f537676f69149e16d7377f2ad935604346

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