Malicious PDF — malware analysis report

Static analysis result for SHA-256 418e10d1fa906f99…

MALICIOUS

PDF

101.3 KB Created: 2021-07-25 04:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 71702673c7af86f6f5a03d9cc4377092 SHA-1: c25d3b36d3b33a107db083920b2697bc8172ad24 SHA-256: 418e10d1fa906f9903bcb95879772b21fe9acc731e110a10eba8ca611813bd70
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious sites. The presence of these links suggests an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/nodckdr4gdc3v80ugi01au89fh/rovufape.pdf In PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/n74quvjrh4qjabt5g0urb4qt76/86256681056.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/i23d6k5ns5ck81l2lck4cuh657/gufukaxefaremam.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8fd8edc9---23610029671.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/89220747550.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073af0f44825---497475968.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/kujewijowuluvuxawigofo.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/90530790574.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210715164306710686j42djt.pdfIn PDF document text
    • http://stilistspb.online/public/files/uploads/files/11053823116.pdfIn PDF document text
    • http://industrialdevices.in/uploads/45762465061.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160904c1a6c7a3---33226470611.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/53561568045.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/kefizuriluj.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094e43a51a20---82176450097.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/68788689992.pdfIn PDF document text
    • https://europartner2.pl/uploads/juruxewudupijamoz.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c420242a1c4---2600640880.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c511c5549---63673437067.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e7a8d50ad---82366024008.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/90093558544.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/jevesilasalidibaku.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/rb1r15048hu87cqf79nlp0ir46/89081684572.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/jideviruluwamilip.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16088e3325a22a---64572620231.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=csgo+report+bot+githubPDF 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_off000126c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126C2 18764 bytes
SHA-256: a34e425598489d8cfc0b724163ec14f8482560f940bd5c79d8959fe8668f3ee4
font_01_sfnt_off000156a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156A5 10492 bytes
SHA-256: 4995cf825275d3939ada09f76e7b60c24c08e38bca3e5e2d6de64720d04dd88a
font_02_sfnt_off00016e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1