Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73958dfc0c73072…

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 10:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8bd286d553ab638f02e81991b5cbf9b3 SHA-1: 404d0fe8614012fbf0c1de08f7d2468e69dd4377 SHA-256: e73958dfc0c730724a7a96dc0ff9d992a2fca06a60feba8c331aa313a551a6d3
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The presence of numerous external URIs, including one with a 'utm_term' parameter, reinforces the phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=the+spider+man+2+apk PDF link annotation
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/bizeputejepemefujivu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/zaxipipiwenijerojorufoje.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/serazuk.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/zexozilo.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/32998649443.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xiratovozixasikisev.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/57545294313.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210904_6F101F62E5E0A87C.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/xakoj.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161354a7d74388---30009558415.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906122720535841.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/776095592.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39704687914.pdfIn PDF document text
    • https://pelicanfinancialnetwork.net/ckfinder/userfiles/files/nelosejikuritek.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/bevodexubotepotipeb.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613511b61e649---96215181534.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/53249058597.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/49c8a5c3d48738b3951f9c933bbfc79f/kidarebaxuzoju.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210906022235.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/68811049178.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/zaxuvajimif.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/vokipoliro.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/57597295189.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/milam.pdfIn 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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 17804 bytes
SHA-256: c11c3280187a4b9ec63dda92f64763d6e850f0fc2556a3e84554b97a8910bfe7
font_01_sfnt_off00010b49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B49 10568 bytes
SHA-256: c580535402669222f77f1f98715a5985ebd5951943c1f1edbbdba5af989f9d9f
font_02_sfnt_off0001233b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1233B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.