Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ad8c9822b1d668d…

MALICIOUS

PDF

82.2 KB Created: 2021-08-01 14:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 45dc6e49bc029305e1bcdbff7a12f146 SHA-1: 535d6a481680159c1de5f730bbfa0e477f111b6d SHA-256: 4ad8c9822b1d668dfeeb4e7f0507ade23f1dd65eeac1089cf8d0a91d724c9163
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The file functions as a link farm, containing numerous URLs that point to external resources, some of which are hosted on compromised WordPress sites. The presence of these links suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://bacsiha.com/public/ckfinder/userfiles/files/78055577011.pdf In PDF document text
    • http://partnercable.hu/files/wokomalo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1aad76ebfa55f72aeedf24a1bab19cab/dazik.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3942c3c159---remomilariwom.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/20042423261.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/80857710845.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/05b560aa90a606e16d9ff8c9928c156b/tezazutijemotumitubefu.pdfIn PDF document text
    • http://chobacgiang.net/webroot/img/files/54354107644.pdfIn PDF document text
    • https://alutat.com/data/file/tarupepogunalabupebaw.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/finefaduk.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/kevitubotenu.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/wukudubulegitogiwud.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/21869884515.pdfIn PDF document text
    • http://pvsystexperts.com/wp-content/plugins/super-forms/uploads/php/files/8rdlmjgve52g4ietb4c5bjt7h3/bugurebimaweganarugato.pdfIn PDF document text
    • http://splogservice.ru/content/file/15618535577.pdfIn PDF document text
    • https://bluetact.com/locktactyuma/userfiles/file/2062007882.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/49003287123.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a842b9d11d6---nuxapusowitidozaguza.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/e8593baa75289427792d341bfa2981e1/3318223588.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609877641a797---pewuwibigovosajutetexow.pdfIn PDF document text
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/8d42q2sngm6jlc1i240qu2n0js/52089851842.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/safaxarunijamagure.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/51308458090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=collections+close+reader+grade+7+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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bbf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF3 10876 bytes
SHA-256: 250eb39a0d2dc86d44d245fba35af93840541c259e520d23c1c7e55002194bff
font_01_sfnt_off0000d509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 16592 bytes
SHA-256: fa1c929fa642cfcf0b0f43639b68849163276d5ac12b3a2745509c9e16db8afd
font_02_sfnt_off0000ebdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000103ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103EC 1700 bytes
SHA-256: 15171638d69c9281a983de8a04f8d213e5ed86d33053034f6aa0dd130c4010d8
font_04_sfnt_off00010bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFF 16664 bytes
SHA-256: d16af540d4fd88c48cf36824f9b8e0cf84a8eb865c41191a85903c490c75e55c

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