Malicious PDF — malware analysis report

Static analysis result for SHA-256 db32efb85e0f8188…

MALICIOUS

PDF

82.6 KB Created: 2021-09-14 05:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4a1a6c48b5ee895ad41634b00560d909 SHA-1: f09690e7d908af4f87a94593195a4ca8f4253c1a SHA-256: db32efb85e0f8188a2d5e56132e2189fbd8f8a499791c7aaf4b49eba75707167
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://fosterfreezesantarosa.com/uploads/files/jeziva.pdf In PDF document text
    • https://losaltos.com/wysiwygfiles/file/dozewagel.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/26443527361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135139486b28---79429946141.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbec1c61f2---15738164108.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/bikemilo.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613950cb48029---gubegiwukakuruw.pdfIn PDF document text
    • https://ww150005.linebot.net/upfile/files/20210906170128.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/95325289171.pdfIn PDF document text
    • https://koparieshorvathbusz.hu/files/file/66866650875.pdfIn PDF document text
    • http://vanprodukt.cz/UserFiles/File/11448609522.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8f7a4933f458e4021513f72f8677216e/28284290420.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/vafokatutod.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://giga-tronics.com/userfiles/files/rarigavaraworutev.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1613285b72a373---pirulegibokono.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/48400749923.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/mupufemoromu.pdfIn PDF document text
    • https://cakkue.com/contents/files/virasogigajowoga.pdfIn PDF document text
    • https://essuances.com/ckfinder/userfiles/files/70225503318.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210905172414.pdfIn PDF document text
    • http://turatabor.hu/media/49487066236.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/xexakexepugeniwetefarod.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/51779029050.pdfIn PDF document text
    • http://htygroup.com/upload/files/deravitosuwulesu.pdfIn PDF document text
    • https://faceless.me/userfiles/files/xebudotib.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/selulasejib.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16135037c63626---92704970002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+block+a+number+on+sprint+androidPDF 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_off0000dc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC73 11084 bytes
SHA-256: c4b27ee53172100ab06e148b5f6158699a4a4f7b885475613d0bb2cb8911a099
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E26 17932 bytes
SHA-256: 64a06a5f126210e43e0281a36f1a4ec8905ec61b9bf1cc8764b8fb657938e015

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