Malicious PDF — malware analysis report

Static analysis result for SHA-256 e376a053c3648d26…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 23:07:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab02a6b910d319b55d10bf239f55d57f SHA-1: 0d744122cc55fd45e82b61bb37c2ec0a46ae9a62 SHA-256: e376a053c3648d26703c11770cbad9d9a342ecc706fa4cb9d6e275bd119211ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://bracyfamilyreunion.com/clients/c/c2/c2db1a97f769835965582c74015c7782/File/27259294317.pdf
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1606d592a38f68---63205938427.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8369ae9ec4---79559710153.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/8okl4fnnlgf1iv41k8k10vd859/pepavodirofumoxi.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762164931f6---zapikexinas.pdf
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/093cb67923cc9e8b863ce020a49c0879/30885160737.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/g81tsl5t2ojupm40e3ur1ateb1/rajoperufigavo.pdf
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/nkkpd97b4vvn4u3h9f3of7ea3e/radetepelaxedidagin.pdf
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/1ebf1226ff3b8c1733a2679b6ac8e5d3/joroxorarinofodug.pdf
    • https://aawyx.com/sites/default/imageuser/file/51323856560.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c3b12e842f610c118acfa51cf7c07c96/8744977316.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/2a5636a4e0b453ff101c9487deb01b33/ropumedaxexerupomixowage.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/4aa19fd7aa52b41610cf83a47c3f2b2c/84444074717.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b66a65beed---64537635593.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/476797b8c830958d040fdc0860e160ed/libilubava.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c4b0e935---52231971436.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/ceec7b535cb991ef9b62ce940c167310/31943802434.pdf
    • http://bloomx.com/sites/all/sites/bloomx.com/files/2893103156.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/nmnej5clklc1h00eqcn5jr58o0/87198877203.pdf
    • https://aawyx.com/sites/default/imageuser/file/vobawiwopotadosijewi.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5fb74fe06---9551690581.pdf
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/ab811faf9e547467ad6ba14ddfdd34d1/mumobelikuruxorafe.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a524cb4fd97---55493454547.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=sociological+method+and+research
    • 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_off0000f4d2.bin
dfd1f3ed5a17139ac6537a6f0001ba80a96560b5b62b559b51c2d278b7eb5cd2
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16580 bytes
font_01_sfnt_off00011fc8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 16792 bytes
font_02_sfnt_off000137df.bin
ee635ddad141f2a92dd4f070012a8c0af4a2abe97f7c24f542457ced2a48441c
pdf-font-stream PDF embedded font (sfnt) at offset 0x137DF 10892 bytes