Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f007e35c1cc2403…

MALICIOUS

PDF

96.5 KB Created: 2021-08-08 15:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b80430f688e8ac7714989a27e5ab7958 SHA-1: 379722da7fd6cbc87ab4f54c1d0ee01315b4acf3 SHA-256: 0f007e35c1cc2403ed412bc2676f6400d479300da9beda60e9e52edea3c737d2
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDF documents. The presence of numerous external URIs, many pointing to compromised CMS uploads and forming a link farm, strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further corroborate the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://aarogyamedico.com/userfiles/file/15656504849.pdf In PDF document text
    • http://chicohigh1987.com/clients/47015/File/dadagufapefakirunalidutex.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/nogezanavep.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/84d000af8401e905d6e7ff88a3b88840/27682688986.pdfIn PDF document text
    • https://louvre.lv/res/wysiwyg/file/32952729332.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210606_071123.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/semaxurosolokubasigomuto.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb38dceb835---25451298717.pdfIn PDF document text
    • https://e-fasteners.eu/media/file/tedok.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/16467048273.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/nezenabafiloxinidulomased.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/87741754645.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f7d53409f7---jopatadanag.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/jumipefopetowod.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b9758631a---kagimuretasopojejimuzaxot.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb7c0b11d6---44352360396.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/kdj993bd35hteslfscs4sf8nm6/6427531958.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/6854856430.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/1e8a29295883911c7c3338e264d29818/paxujotoregipo.pdfIn PDF document text
    • https://zebcom.in/userfiles/file/40658489155.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/61313a2vikbt3f0mdhofct0c13/monezitujitiwizozako.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4e3360546---34011506215.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0400f56ec0---38440488481.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=progresiones+geometricas+ejercicios+dificiles+resueltosPDF 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_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 19028 bytes
SHA-256: 963b3329eadd56d2cc173f38f2f380b2c75e98e4b2cf57cbdea7eae3ff413a9a
font_01_sfnt_off0001405e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405E 11048 bytes
SHA-256: 7e7d6e0b6ef3e6f6ad019541eaa720d1ee6dacef43a6c67a9fd9aebe9d25f4ad
font_02_sfnt_off000159e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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