Malicious PDF — malware analysis report

Static analysis result for SHA-256 08d24e1f51cd8967…

MALICIOUS

PDF

114.8 KB Created: 2021-06-18 20:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: f02866953b4a044367737e2a2a93c01e SHA-1: bf3fc86a77561ad0443f0ef77d447e3789312eab SHA-256: 08d24e1f51cd896715c110c6de298526fbcb9a2d798c3d37d2e34bd0d3a0e1f6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest an attempt to lure users to external resources for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.bash.cl/media/file/zurumuza.pdf In PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/725bd48446359594c4c0942c1c4b099d/69829851618.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/svosilni334apk7t2a7buq0ri4/fovanitunilawu.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/44885625686.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/c1371b3ff4da6cb63dba19905135b658/lufurubabebosubozujixegez.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/10872730365.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb48d0b4b3---40387930706.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6d30d2d2---favifas.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/68191659329.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210523194854.pdfIn PDF document text
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/a5b7ef2bcc28920a72aa96ea9dd618e7/71520630540.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/1f2620aaaf96fd697794ec58ae9ac30d/40449954103.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/a9ac528e0344325ec6faf953ec02d6b7/sutupabobuponekozuxad.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d31b141683---41381209489.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/c7fe5438b5262f3c16ff244742780242/rafepiresomuwenezoxotepo.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/90219730424.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/a24b67408ca43b69913d07a93a016a9a/sudiremegazafa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=stein+complex+analysis+solutions+chapter+3PDF 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://scripts.sil.org/OFLIn 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_off000147f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F6 5492 bytes
SHA-256: 0dbd8102b1964e0fe6896ff966fc6d4095837c0fe67cf78e42d2f2ed56107005
font_01_sfnt_off00015a6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A6F 2192 bytes
SHA-256: fd759b236742345d828e05c3f8d95e6f684c4df2566097b8ce17a4edce5afffb
font_02_sfnt_off000163c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163C2 14984 bytes
SHA-256: b483d18727c2e135f6bb9a4c1c0676ea48c296870c9db8ba78037c3d89110052
font_03_sfnt_off000196b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x196B9 17012 bytes
SHA-256: 58cf12d1de44178027cfee82d5d1aa02fc6e38092a8f88e797fe07e25bff4fa4
font_04_sfnt_off0001af1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AF1E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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