Malicious PDF — malware analysis report

Static analysis result for SHA-256 666a5a4298a3b4a2…

MALICIOUS

PDF

90.7 KB Created: 2021-07-03 17:52:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 70c213eb13e3c1d843ce93973df533ca SHA-1: f00f3d5d48808ff563c54fd4d64d1012943f5584 SHA-256: 666a5a4298a3b4a225129e6014d9f5c8d6052f3ef6cf3b1a79caea95759c7e79
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve as lures for phishing or to distribute further malware. No scripts were extracted from this sample, but the structure and URL patterns are consistent with a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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 https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db79ce3af53---56916596272.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a059d1ef92---kavinutupalegupanir.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea2640c29c---sepexikud.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/0f7379689b6db56d8d3b441ef06dc0ae/jububilorulo.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41e9b75a56---lifeduwatufidukuketosok.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/fb9qe7kpqpt4l0kfn1gosdem09/86251006951.pdfIn PDF document text
    • http://sartoriaventurini.com/userfiles/files/sewosejuxozelofesadelil.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/jqrrbg1rk04or5uhof3dv3b286/rikipim.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c88c3aa5f28---81714514343.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/bonegubev.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/56g5b04u0iqorrc4l5beibchl1/vixif.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pinojavif.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jidunejode.pdfIn PDF document text
    • https://aashianarealty.com/file/18644402808.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/5sr6926q0i9g2hve13ksh4l4jb/84288863614.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/rigarusigiteta.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e549fe65d5---39283964427.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ltc19fd948gimf3uc1f9t0r1bm/96094628298.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/020llq42iiop9mf8n7soknp7b6/disadevipapotu.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/411bc05b77648fccee0e54fa94bb0c89/74935544881.pdfIn PDF document text
    • http://korytnica.net/data/files/44358672885.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608326fe41de4---zokawuba.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/gilikewipaxaguvasejikif.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/9451dff6aaae3f2022ee4351b984e7f2/wapupugijowe.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cc5e8e3f1f51a8371f524a1618ef9468/3944586709.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072bdf5def13---32998332505.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=zoonotic+diseases+in+cattlePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB68 16092 bytes
SHA-256: 98bcec2be85b547d266a48c61dccc50816b624367bf69e2f194f2b8087d010f5
font_01_sfnt_off000100a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A5 17200 bytes
SHA-256: dc40705a929facb82de689c8fb96470e516a11044913c6bcc404e2ec402aed75
font_02_sfnt_off00012e04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001461b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1461B 10224 bytes
SHA-256: b7bb62751aa17d2ab76fd513a2a214ceb660b86b8250259b2eddc4bcbf45d36a

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