Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cb04cc39d203d7…

MALICIOUS

PDF

88.1 KB Created: 2021-08-01 00:13:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 843b798f3dead58fba2bb4897671807d SHA-1: ff467cab724e2712fb84eba8bdda38def737ef52 SHA-256: b5cb04cc39d203d7ffd18c31d310004b8e400d725889db9cfe32ce07990f8622
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://himalayanthailand.com/image/upload/File/77847065884.pdf
    • http://sbox-technology.com/upload/datoteke/8298395347.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100e153f3ab4---48181108211.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a00f56de165---rebegabipodo.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c40eb799672---16385599465.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/83179405793.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b356e5ba42e---44619471045.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ab78e2292---32727364440.pdf
    • https://rcot.org/userfiles/file/73111236544.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/wedulugo.pdf
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/40c4322ad98415f1937ed7cfda3480dc/tujifaxuzarizasivel.pdf
    • http://mail.teleserviciomalaga.com/ckfinder/userfiles/files/zunoziwodazotedorulux.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/paneboxodetolozasuwudani.pdf
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/550730e6523fed5e6e747089d9d3503d/79793311667.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210613/file/16236178969154.pdf
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/pq54u77tj1qoftqnq9i5hvfd3m/47407139562.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/q5m60brl96jlb33n25np5pklea/16898516495.pdf
    • http://sosnovgeo.ru/userfiles/file/40262662968.pdf
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160cb58bc10de8---pinabuzaworon.pdf
    • http://skogsformedling.se/bilder_umeny/File/48519066879.pdf
    • http://avandcie-automation.fr/ckfinder/userfiles/files/guxaxuwe.pdf
    • https://gangnampools.com/contents//files/60725656003.pdf
    • http://botosani.ro/img/uploads/file/wadigegapaluvunubizales.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c30111f14---lajumaruna.pdf
    • http://imi.vc/upload/files/lazom.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=excellent+english+grammar+book+class+12+pdf+download
    • 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_off0000efd0.bin
1f2be4218a937b9b8ab4716de31563393ec8f07f7ece44d5988fd20a1a449c56
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD0 17204 bytes
font_01_sfnt_off00011c88.bin
c556ee17fc487897e0a0572953b833240cade7a5f33ebfab071627402a418ed7
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C88 11640 bytes
font_02_sfnt_off000137c0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x137C0 16792 bytes