Malicious PDF — malware analysis report

Static analysis result for SHA-256 2531c20b879c9e3f…

MALICIOUS

PDF

92.4 KB Created: 2021-07-25 02:42:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0795a8a4b8f01dbf4c16d5536fbb51f6 SHA-1: fd7f2b77c69ea9a09bd7476cf25e20a2e5826fb7 SHA-256: 2531c20b879c9e3f11d0abf209407d54b50228d43865bf2b1f4fd07c6008c03a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads, suggesting an attempt to lure users to malicious sites. The document body is heavily obfuscated and unreadable, providing no direct content clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://chetanaus.org/bheru/uploadfiles/file/22360749486.pdf In PDF document text
    • https://vivekanandbawwa.com/userfiles/file/32513483859.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/2031755095.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/48285211201.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/5e39179a5b70eb35af2b5c9cbd53ef88/30535728041.pdfIn PDF document text
    • https://dm288.com/slicice/file/35811797457.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df05c89188---fovazaxoxifenomu.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/b8c02339f82fd3b0fc73bed5419878fa/62417281610.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/7a24d6e27254b7fa4f3c35c3ae7f0f94/sitaxorudan.pdfIn PDF document text
    • http://pajurioverslas.lt/ckfinder/userfiles/files/derarumufib.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/wuramaposin.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/81f6e9652bf19f9140ed73f9d2f377eb/bizigudaxalefesom.pdfIn PDF document text
    • http://patroha.hu/file/18583533759.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/85005400714.pdfIn PDF document text
    • http://rsst77.ru/upload/files/ropewosajo.pdfIn PDF document text
    • https://codecs.ro/images/file/82541976235.pdfIn PDF document text
    • http://longvu.vn/Images_upload/files/33191126069.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/5521d231d7f59cd7a63ae2e5175f0c89/68535273338.pdfIn PDF document text
    • https://monyetmesum.com/contents//files/kolovujukarexube.pdfIn PDF document text
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/1sfiou2vfgb274767v2l8ncu9j/66200120994.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac407cf63f---57757787563.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/2g48h1rq4c64vvj826qsaolcfb/24518677491.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984163edd30---18311020465.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/tinakhue4p1b24pvgp705t3dn1/19919813606.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/14285046860.pdfIn PDF document text
    • http://maxbrio.kr/files/files/89522202299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=second+conditional+exercises+if+i+werePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16336 bytes
SHA-256: adf38969d40f501586e0caf93d33991e243baeeecfe575c4831cdbf64b7044fa
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10732 bytes
SHA-256: 042a0b774c0bf4cf93d0e7c1b646b340e8a4ee7d4f37ff82b3920068b56d90d3
font_03_sfnt_off000134c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C7 17488 bytes
SHA-256: 7035ef632e4eac8cf3e65baf9c7effb0643c9d3973829c94f3baa1497f03ee11

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