Malicious PDF — malware analysis report

Static analysis result for SHA-256 43ecb0b0f9bf925c…

MALICIOUS

PDF

78.1 KB Created: 2021-07-16 18:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7a5b31fa44358429c8e320aa11ebb5d SHA-1: a4e2b8efc3bd8f24f2104137a5a7991fc3282c09 SHA-256: 43ecb0b0f9bf925cf5958682a2cdb2e8627befbc1454b0ecf23078a76723b69b
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c67687e05---75824829643.pdf
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160962d12bb1ec---9008027192.pdf
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d91cbb36bfc---55566644628.pdf
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/49c769325ddb9eca437d3dce9786247d/vowibugojunepup.pdf
    • http://jevades.com/aircraft/fckimages/file/15559823237.pdf
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/ffbfdeb4961eb6354d5b4acffed9f18d/gabuwutitubomexojabinakut.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160ae84246498e---lukukoxametakizebudu.pdf
    • http://hncastlecable.com/d/files/10662009135.pdf
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/0b3e9f413e45657df9c5f5ae49dae5a2/87204251085.pdf
    • https://abe-rdc.com/userfiles/file/faluxo.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb470296e34---93039536653.pdf
    • http://www.aadhar-interior.com/userfiles/file/mijileketodisubufo.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cfb6c9257---nutoxuviloboze.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5f9009b92---xapofadasusaja.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/7e91f0cdc68252aa52ad9398df0e64e3/kurewalawiro.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/shh00lpjlm446in7e1ppg6b2u0/nimilokasulej.pdf
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/354fb4b70ff26781ee5b13116d5f3767/farajuzonematozi.pdf
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c801c71323---kawomiti.pdf
    • https://info-jimukyoku.jp/lot/upload/files/24150994763.pdf
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097691f739bb---falorurugenewasovowori.pdf
    • https://mariapolis.net/ckfinder/userfiles/files/41615192609.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=simple+and+compound+interest+worksheet+8th+grade
    • 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_off0000cafd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFD 16792 bytes
font_01_sfnt_off0000e314.bin
bae03ed9a0a5005663176f1ef11f8826f2539a77a334b793b87df3e23856cc00
pdf-font-stream PDF embedded font (sfnt) at offset 0xE314 11524 bytes
font_02_sfnt_off0000fdfc.bin
0a76020f484fc436ca456fa6d12afbb9b483e409aad7028f857a8afc44806f62
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 17412 bytes