Malicious PDF — malware analysis report

Static analysis result for SHA-256 aff9b399aa39cbb8…

MALICIOUS

PDF

80.2 KB Created: 2021-06-29 23:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 73d294d1a6708aa73f66efb4f3e4c6a4 SHA-1: dc9ef067bcb73e9e9a97d3b8d64480235a4b509b SHA-256: aff9b399aa39cbb8e1ea5bdd64c64573e2062ca00098c96333da889280647bdf
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely to host further malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076d06f7f997---dedigodaborupofasa.pdf
    • http://foodchemsino.com/d/files/pireveruniw.pdf
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe3524c09b---fabavulimafite.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0440117cd0807640e72c113a80456dc6/mibusejejapilura.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/278i9h05g1q8beppi6i0koe424/nepusazovefus.pdf
    • https://lamaisonducoeur.ca/upload/editor/file/18151925884.pdf
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c4116b72---54985109099.pdf
    • http://kubak-ubezpieczenia.pl/userfiles/file/11117913261.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/tarunenugu.pdf
    • http://danfilenemd.com/clients/67744/File/82239178714.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e575d071aa---nefitawujibi.pdf
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd7536b1d0---85699441768.pdf
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/48a27c419fab7641072c9c037fefbe04/vajasiwerafosoj.pdf
    • http://antonio-pelella.eu/userfiles/files/33010579540.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/fesu9aribk2esj9qt4pr99chg0/nelagegifanuvike.pdf
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/45jvss4gdsd5nujkt87uvl1un0/48843598950.pdf
    • http://mg001.cn/upload_fck/file/2021-5-17/20210517024746148497.pdf
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52da75ff4803ece4d402fb8c4ddec2af/fovomeja.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ktlpk52spc73mpvnkj23346h7d/64483475664.pdf
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2eed11c8cde4b02a3487cb91d2f4bd2c/11136137336.pdf
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb2e6d8e5---pafub.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160a1906d96684---ludesatadurudatigojefed.pdf
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1f2d7d8e1---nemowogufazefizidevibigev.pdf
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/74142abf63b556729c2efbd815fb9e3a/6879371545.pdf
    • http://antoniolescio.net/userfiles/files/vixalaziwetefabosom.pdf
    • http://zhuoer.ltd/userfiles/file/ribasagemusijav.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=we+are+all+brothers+and+sisters+in+christ
    • 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_off0000d917.bin
3cad3f45c63b7b7fe1bdbd89daffb4ede630b27e57d19f8fc225b065baa1876a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 16220 bytes
font_01_sfnt_off000102c2.bin
05d373eb95e316c6a17f7dfd4307f7f0044cf369f4fd360f92f705e6390503f5
pdf-font-stream PDF embedded font (sfnt) at offset 0x102C2 10600 bytes
font_02_sfnt_off00011aed.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 16792 bytes