Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80810f62e2d6c48…

MALICIOUS

PDF

100.2 KB Created: 2021-09-04 00:33:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5e8efa94fd7bedbbf4df0d745b4db017 SHA-1: 3063131a0b447f1516be477d36f2d68606d0c9fb SHA-256: a80810f62e2d6c48c8fd4c5f66a42932996dc46ef5cd358eb4779c52a54ee644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing. The document's structure and URL distribution suggest it's designed to lure users to external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/8461c695d741d971d69972349b39996a/9486902884.pdf In PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/ockptdonc005c5eqi0mvhli8rq/97304537258.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/zesuleralaful.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/wapapipafaraterikibipo.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/22353349811.pdfIn PDF document text
    • http://americandeliorder.com/uploads/files/77223134450.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/da229pfqnc4m1hoan2k6e7j766/gilanitotafe.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/68277705426.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/37302368570.pdfIn PDF document text
    • https://vleek.com/uploads/files/vaxufujedezifuz.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/zoxofedozajobigifovelun.pdfIn PDF document text
    • http://letsbelegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kamuvaxemovawijuvema.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161053f4dc5607---sitewupofazo.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/8bfb376ec464145dc5e81022480008ef/72035361916.pdfIn PDF document text
    • http://younewstoday.com/task/userimages/file/kekarokilevew.pdfIn PDF document text
    • https://soechi.com/userfiles/file/binelulezat.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/xudiwugititomamuzov.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/89d3ee74b8aa2432d6284fd7332f37fe/remobesak.pdfIn PDF document text
    • http://lafenicealcamo.it/userfiles/files/baleributiwamoduxed.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/82576596044.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/18763444049.pdfIn PDF document text
    • https://ltanimalpark.com/wp-content/plugins/super-forms/uploads/php/files/4517ff0797aca376312582f28d5eb292/luzusafasenugisodemojesor.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/tajubasijutibilufinoxaru.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/26139495144.pdfIn PDF document text
    • http://aurora-c.jp/files/files/kusulofumekona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=microscopio+zeiss+primo+star+manualPDF 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_off00011dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000135d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D4 19304 bytes
SHA-256: baf7ceedc97ca79c2b786f939fa40bcedfab9373fd87f7928acd8ae595d2ef4a
font_02_sfnt_off00016878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16878 10688 bytes
SHA-256: fee30f40c0f7866fd8f802f06dca5d71f2d1c66e59681a4161866a87e672a32b