Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b3952532b124917…

MALICIOUS

PDF

84.9 KB Created: 2021-07-01 20:19:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9933ba09911c201f0f929846a4821383 SHA-1: 611b1c5ea1f8e30f92027b9f0d6b28cf83f7de91 SHA-256: 9b3952532b124917e1b3904605fbfc9a765a7c89633bf56d8702cd70093b27d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised CMS upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://fecoil.com/userfiles/file/64374214190.pdf
    • http://ebslang.net/_UploadFile/Images/file/59705038663.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c13d13542d7---lunurawovojaregojo.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/1kdnvnb1icpuk0c9pago2ocl70/20913859074.pdf
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/891766f041847120aff63423d6079b76/81349927850.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc69ca5b43---97575343027.pdf
    • http://agama-rc.com/upload/files/tarizuwolu.pdf
    • https://pacie.vn/web/uploads/files/fomoluwuwanewotusulu.pdf
    • https://gamedunyasi.com/calisma2/files/uploads/34682189004.pdf
    • http://artospace.com/pics/file/miponenikanugifosejodute.pdf
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/8cfsfce32k44lq67m1rmr7kbe0/5149051973.pdf
    • http://ahkjt.com/upfile/file/90672745827.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075bd3aa09a2---45925795371.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608312a6dac80---woxebovalirukafurop.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/6c6b19ud1i20jukhvie3euf93q/11056972790.pdf
    • http://mg001.cn/upload_fck/file/2021-6-11/20210611134943302919.pdf
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6aec4a4db---gofebivedafitum.pdf
    • http://azizolace.cz/images/file/nozasubefebovefojesivezaz.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed74b45abd---22644863225.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/0843d0298bcec04bd0068975f9d2a70a/kasemizewif.pdf
    • http://bantinnhadat.com/users/files/fipawotosuzanis.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/f0f9f984c400fcc5bed066ad469292cf/sosalefizo.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/9peap6h563cjco8goqdtffqen4/38333048708.pdf
    • https://greenfuturevietnam.com/Upload/files/lolamobagerirunaxozotuf.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=online+convertor+pdf+to+ppt
    • 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_off0000e863.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE863 16792 bytes
font_01_sfnt_off00010075.bin
26741ea68e5fc1883f911d700dd5d87a83728e94ea502b59dbf79fca0dd5986f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 18880 bytes
font_02_sfnt_off00012f04.bin
170d20997ccbb1d2d37cba35ad8974f70cc726cd03b1b2016c628013464ab77c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12F04 10372 bytes