Malicious PDF — malware analysis report

Static analysis result for SHA-256 83d4b448e2cc4ba1…

MALICIOUS

PDF

70.3 KB Created: 2021-10-01 20:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0fded48a7437085f9dc4aa2f887ef2bd SHA-1: 3d1d3c6956bfecb528b594c22534423150debf38 SHA-256: 83d4b448e2cc4ba1b443e0b75c1eba30a4e04fd901351e45166252a8e3772063
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or link farm attack. The presence of external URIs and link farms points towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://nomylo.ru/uplcv?utm_term=boom+beach+cheats+iphone PDF link annotation
    • http://uptownherndon.com/uploads/files/94266161132.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613229a2ade7d---90985155446.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/55021393749.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/bh8apouk2jgko3nli8ip9rm667/43602110380.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/94277513963.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/63357837349.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b1fee72d87f983f75f04af3f647da514/walisiwumupununifo.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134116ed068c---nanukifiv.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/segafuvoxenofebaratujex.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/b8a1229b2535b16ceb8318a98580b615/gelisimuxudipokojevovojat.pdfIn PDF document text
    • https://pellevah.com/upload/files/lejagirolodavepituw.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/50893399346.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/27406197098.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/bagupumufezov.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/fuwujifubagalakamegoneg.pdfIn PDF document text
    • http://wwstationery.com/files/file/72762374918.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16157144adf676---larenoluwifuri.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/33097741523.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210912130914.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/63097616394.pdfIn PDF document text
    • http://eg-connect.com/php_codes/Scott/VieauAssociates/code/userfiles/file/pavajab.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/10258477579.pdfIn PDF document text
    • http://jtipartner.com/ckfinder/userfiles/files/69246063600.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc37a294f7---36567313265.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/95269574688.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/woxafukadevepima.pdfIn PDF document text
    • 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
stream_003_off0000cb0a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xCB0A 10684 bytes
SHA-256: 7529c9a0d46e5f59bddd3fd832421ab2c6746a4ce8f6ed38ae4c5e341a0ff4af
font_00_sfnt_off0000b2f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE330 15504 bytes
SHA-256: b2c7e3bb06ff6de462e8f7fdca4b89f98ef69e7f963cecf18048ca2c831dfdab