Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8802601bb3e0c33…

MALICIOUS

PDF

79.1 KB Created: 2021-07-21 14:36:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: bdc7844263bcb7f82bb42be822ff869e SHA-1: ae8514fc48f9786afed5c6fd69095281f5a4c476 SHA-256: c8802601bb3e0c3322b3907d1c01058485a6041d45ba8b149074592ef56bd387
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to compromised WordPress sites, likely intended to redirect users to download further malicious content. The presence of numerous links on disposable hosting and the use of UTM parameters suggest an attempt to obscure the true destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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 http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/9d25de52c1bb22fd43e380d77a309b6a/kopupozex.pdf In PDF document text
    • http://wonikqnc.com/upload/editor/file/1623262528.pdfIn PDF document text
    • http://blatt-gruen.ch/files/bajevesumasowunixi.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/saparotofaforufasosav.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/10298233634.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/rasive.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/s68n9ulpq3734r0l80ccqqed0n/24210264446.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/62191034dd874b97ab5a66850b020455/78832117355.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/85506934943.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/85458794403.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/8f7071bf4558e82b78164fb8f287632e/26941183660.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/24272727555.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a001795a62a---27334761122.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/mewavibumaxikejesaje.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/53460704825.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607173de72dea---87002403971.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac5bd4078e3---39552748413.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16074d7461cb73---kefidulumuki.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086036343166---numenojunovilakekeme.pdfIn PDF document text
    • http://moristas.com/userfiles/files/56893430105.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/8828595349.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/837051bfc4c663f9918d30a681de6c5f/93880542251.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/negefapikimip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=etlunnave+na+palle+mp3+song+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3CE 2652 bytes
SHA-256: f31be054aa7ee08c94c03460cadac09c3dd2f081951d601a287a4ae70a8434ef
font_01_sfnt_off0000cf22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 17276 bytes
SHA-256: 181fab5d84d8513bb23990426aa8cbc057c32a94ebcdbd804bf127bf5f9fca66
font_03_sfnt_off00011516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11516 10952 bytes
SHA-256: f52e357c9f2831036e35b1bc684ee05cf770747a126af3357f5495cb832d60d2