Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc5eba8eee1e104…

MALICIOUS

PDF

88.5 KB Created: 2021-07-09 03:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: b1ac341dd8f86e179a951784580de7fd SHA-1: 57fdd354603003103a420f9f155d8985ae74a99c SHA-256: 1fc5eba8eee1e104d0ef316111ee68a6325652a2662791f16079049b16c6f919
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://drafthe.ru/uplcv?utm_term=sherlock+holmes+quotes PDF link annotation
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a7a3e78d---barusosajidisedol.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16094ce9f90101---28979691094.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/kajijabofagiwanepoge.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa34d1ebce---20797186837.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/22867402800.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/fugovafepukuzugokidekol.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/500237996.pdfIn PDF document text
    • http://krukewittfarms.com/userfiles/file/12253594777.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/4f50c0acda0bd6aa5676e0442d5bcbcf/giluxejaxedama.pdfIn PDF document text
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5adb17bb7---47100252822.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/5110bad6454f74c03866b43da35d5094/gusomuxotibopojexo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160834b76b9791---namuw.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/4d0fde6b358b75a643c4a6c526b1174e/rivazoke.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/vbb5vhpq492mkpijp322cu8082/34062948078.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/gipenuzul.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/97582057134.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/nd76lfcb3kpc3c9q3l5nupgpi6/85534089283.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/4119443a26faacbf8320b948689139da/japudekerivejotudituz.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/279f64c4bab414bc1735b2081c43b5a9/fajadekifepoxi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0a93dc4d4---mujawabesisenapukuzo.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/varisosubibaluzufexejogi.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/c763325866a7430b23539b4b363c0c65/lofanimuxavujol.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/039325b8593c061883751119830aaf7d/45555539878.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/dalimuzagoreza.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084eddee8747---jobusavuxabigaroduzo.pdfIn PDF document text
    • http://www.bestofsherlock.com/top-10-sherlock-quotes.htmIn 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
font_00_sfnt_off0000f880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF880 10548 bytes
SHA-256: 273b9750c6dc0ce98721e53f88ceddf33c99fdbdeca49c3509b66e89425ee0b5
font_01_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 16928 bytes
SHA-256: 1b17669df4261258fe07ab4975a0bf6a0f0f8d73eeaf8de89bffa8ed1a43fd6b
font_02_sfnt_off00013caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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