Malicious PDF — malware analysis report

Static analysis result for SHA-256 861efd20d5e62393…

MALICIOUS

PDF

77.1 KB Created: 2021-09-11 13:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 6aa135c06cbbb98bd5bbc5ed5cfa1f6d SHA-1: 936016e3974c7936783b2568e973bdd1ebbddc1c SHA-256: 861efd20d5e62393ae79f1a409eb93ccae521ca1d6464cabdaa1680c8e232602
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised websites. The presence of numerous PDF links on disposable hosting and compromised CMS upload storage further supports its malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://t-eamplus.de/web/editor/files/xujejebiwavewijapex.pdf In PDF document text
    • https://tims.ro/ckfinder/userfiles/files/kerivakijirakike.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/wovutas.pdfIn PDF document text
    • http://www.toptehnik.si/images/wokefubikise.pdfIn PDF document text
    • http://satakantaresort.com/user_img/files/27725029517.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613347b445c69---betegetuwobojomaki.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/161341a0c46ec0---jalovubinonogubuzotamali.pdfIn PDF document text
    • https://ofly.om-digitalsolutions.cn/upload/files/9136827337.pdfIn PDF document text
    • http://safarang.com/basefile/files/74925503353.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/varoge.pdfIn PDF document text
    • https://bushregenerators.net/userfiles/files/gelelafovegazujalaf.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/zodugigolezaroturiwogiwop.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1613817c2d7769---xulosibezadivunefe.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/31634095107.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139a16704013---66775933965.pdfIn PDF document text
    • http://ateliergermain.org/sites/default/files/file/29930533061.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/80718836896.pdfIn PDF document text
    • http://kor-ra.ru/UserFiles/file/zorokazemuzivapafam.pdfIn PDF document text
    • http://dsfly.com/uploads/files/99657983625.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/jukarugazubulomidedebor.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/48874499426.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/rizumar.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/gawebov.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/83842853401.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=what+if+we+forgot+phone+patternPDF 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_off0000c9af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AF 17512 bytes
SHA-256: b6637613df3aa1139a1178e29f2c04756a943bcab96c5f264c9fdac55ec2c6f7
font_01_sfnt_off0000f6f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F2 10500 bytes
SHA-256: e4ed8fee587acce8553cb7f7b95e31135afca644572a6e8ae0dab12bca250843
font_02_sfnt_off00010edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1