Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b2fa6d52d7f873…

MALICIOUS

PDF

151.7 KB Created: 2021-07-01 20:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 78f5b830aa34ad4bf8c6b8f0667a3019 SHA-1: e5fa1a773824fdeeedba46d1d5f15e5d77aa520e SHA-256: d4b2fa6d52d7f8736c202b41d17a1f5e008e179906e23a491c252ac62202d9cb
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is unreadable, but the heuristic firings and URLs suggest a tactic of directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bed0bb40458---wenuwap.pdf
    • http://446888.top/userfiles/file/rijewutokopusa.pdf
    • https://pjkconstruction.ca/images/file/bufifubobuguloverabi.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a884b02841---75264783892.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/1a688886e1121ddbb605280546e33472/80654850666.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b209c4540---91588394156.pdf
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758e6009d87---62713225915.pdf
    • https://mercerapparelss.com/userfiles/files/9099968553.pdf
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sidoroxit.pdf
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/9390f624088d31f7eae1cfa21ff1fbc5/napusoni.pdf
    • https://vntdc.com/upload/fck/file/44248768104.pdf
    • http://bmsorganica.com/userfiles/file/6297030353.pdf
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d74809e2bd4---sarupip.pdf
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/81cbf0c315da277f9afe9c7ed7ef5f95/15376444821.pdf
    • http://sartor.ru/upload/files/jebasokovirojejofude.pdf
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1609d39b8d3607---11976395115.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160720803d3de7---13985753169.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ddbcddcffc6---suvafeditegepimeziromo.pdf
    • https://fedico.ca/upload/editor/file/siranipigibu.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5ad216ab8---bazilubu.pdf
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8a00724bd---6922880799.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed57f3d6e0---foxalet.pdf
    • http://zonazero.es/userfiles/file/9768780098.pdf
    • http://hublihorse.com/uploads/userfiles/files/12423580629.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a99b8d2e305---saxonajagijozoviruw.pdf
    • http://sillajen.com/fckeditor/_upload/file/23473640304.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=management+accounting+includes
    • 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_off0001f35c.bin
a45a2832fb7048f5acadd085c6c5b4968c4ab3853139db13c13c764375447d9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1F35C 17300 bytes
font_01_sfnt_off000220c4.bin
b061173c72e7ae078e9c141922f65e2f041ea7a9858e76484c10487522a15850
pdf-font-stream PDF embedded font (sfnt) at offset 0x220C4 10708 bytes
font_02_sfnt_off0002391d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2391D 16792 bytes