Malicious PDF — malware analysis report

Static analysis result for SHA-256 e62e665eff216e99…

MALICIOUS

PDF

87.0 KB Created: 2021-07-15 12:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 171a80d3727f6f2a0ddb34b1953c3e5c SHA-1: 707500340cd086332c5f0b2a928c83798be9b23b SHA-256: e62e665eff216e99abe0efdcc2006359dbd50964d48d24315f74976bd5d80dcc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Static analysis revealed it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely used to lure victims to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/29eb52af97c8719efc10220e498a5ef8/70447767121.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/91596130849.pdf
    • http://lawrence-spruill.com/clients/42275/File/bajalomesaxutujatatopivit.pdf
    • http://maytinhtuyenquang.com/home/maytinhtuy/domains/maytinhtuyenquang.com/public_html/images/file/24223420735.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/tlpp8rpgnvue427s5ti4bv2s3o/58545760210.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cef1bb2034---12956718867.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ef98cf03c---bexagod.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/0557c8ede197808ecaeba58486b0a921/57694060912.pdf
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b1f9e840a2---66784113988.pdf
    • http://kopdesign.nl/userfiles/file/bozemes.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/ba7cfa964e24a2f557634ac172c1ee5b/4260229426.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/duwifajovus.pdf
    • http://moskvaznaet.ru/upload/files/fabifebaxop.pdf
    • http://tuzvedo.hu/elemek/file/gazinafoteraluwapid.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16071cc148cfff---teditexuve.pdf
    • http://chandigarhdatarecovery.com/files/file/64294053415.pdf
    • http://diversecityuk.com/userfiles/file/12386218472.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba01148a65b---susiduximu.pdf
    • http://arcadia6465.com/clients/f/fc/fcac8d81e62e7f23ed02b02243def538/File/siben.pdf
    • https://unosms.us/userfiles/file/22644101793.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d3d39091d---delagipevutaw.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/4kas94mdqpk7bi4bh70rr7q261/71686953598.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c3b41c9ce76---birewerazexukitipazurezam.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/16092c6ce62916---68850793196.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=nervous+system+and+the+brain
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f30a.bin
d65a24b6124a91f31be25c208711426af59b86ac658195bd5568d388873e9a1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xF30A 10864 bytes
font_01_sfnt_off00010c06.bin
a66b160ed0f86cf343f5e6fa0622ab8c14a1dfb44a99f0fc0d15c9c39efbcd4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C06 16520 bytes
font_02_sfnt_off000136dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x136DC 16792 bytes