Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e55697b8082fe0e…

MALICIOUS

PDF

80.6 KB Created: 2021-10-10 15:57:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4e61cedc4210ac186b1d809dd6705659 SHA-1: d47e239924dc2cb472781e45bdf5e8c2e3547480 SHA-256: 5e55697b8082fe0ede414c3e222b0ebf79cb25fc3490227df4d212c109d48601
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple URLs, some of which point to compromised CMS upload directories or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect the user to a phishing or malware hosting site. The embedded JavaScript is a primary mechanism for executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/6411738415.pdf
    • http://kimwendelldesign.com/ckfinder/userfiles/files/fonebupazidegapup.pdf
    • https://srldirect.com/ckfinder/userfiles/files/nolegi.pdf
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c4659fabe76f39130f9562fdffda2810/84790295803.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613860054efda---befuvidev.pdf
    • https://8cj2aja7-8mxb.com/contents/files/52456168700.pdf
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/26816115969.pdf
    • http://www.pilartangguh.com/file/34975188774.pdf
    • http://marinda.ru/pics/images/file/77012984907.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/60369fb75169a31fe3aaefb4b03910a9/logosezoxonowojigo.pdf
    • https://www.fibertech1.com/my_content/js/ckfinder/userfiles/files/kodilezaxerumodifijonupe.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161404b1bc8e3d---53381493297.pdf
    • http://pokrowce-ochronne.pl/Upload/file/siver.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/nepug.pdf
    • https://myphi.biz/nbloom/fckuploads/file/26494528202.pdf
    • https://cqhuaan.myhost360.cn/upload/files/09-25-11-51-23-27.pdf
    • http://westfield.qa/multimedia/userfiles/file/javewajoxaxuf.pdf
    • http://kachelofen-prommegger.at/fovumokurinug.pdf
    • https://irastuff.com/admin/ckfinder/uploads/files/digavujububatazibifalifo.pdf
    • http://cnsgawefgl.netsociality.com/upload/files/70195583876.pdf
    • https://rmp-traueranzeigen.de/cms/files/boxanusawunokowufed.pdf
    • https://ytdrive.com/CKEdit/upload/files/14883005213.pdf
    • http://agriturismolataggiasca.eu/userfiles/files/47737342188.pdf
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/23290579239.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=anatomy+coloring+book+pdf+free
    • 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_off0000d29f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD29F 16792 bytes
font_01_sfnt_off0000eab1.bin
ddc419d9a775d9aecd7e74df0dcadb6127f3fbe73eaef5ce6e55d2edb1ef61e7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB1 18800 bytes
font_02_sfnt_off00011b9f.bin
58033d726a7f52eb4d0365e55dbb432ea3895aa029850bee6dc09a177d423bbc
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9F 11124 bytes