Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4ad392b988b0c6…

MALICIOUS

PDF

140.7 KB Created: 2021-07-03 00:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ceb239a4a96af06aeba2853e3b47c386 SHA-1: 92ef85e176ff6668ee9de62a7bcc1e6188e0460b SHA-256: ca4ad392b988b0c6762c0f18be646b412e396c6722b238a0ac87bb62632c964e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. The document contains numerous links pointing to compromised WordPress sites, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and links to compromised CMS uploads strongly suggests the intent is to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://crewmak.ru/uplcv?utm_term=psychotherapists+and+counsellors+for+social+responsibility PDF link annotation
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080c01c22177---10542941214.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/95705635244.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0adcaebec---xuzikoxonapegekisuxogo.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078939847cf0---38826075024.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097814487908---38045148926.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1469ed5f30---zopedomosega.pdfIn PDF document text
    • https://raljob.com/userfiles/file/83263567291.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/45939206533.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/e1ert61kuqdun34liai8dimhdb/70930956656.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/bd9cfa26259075f0fc1bbd8c4fd13c47/66136908955.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/9b0fc4e8f03d390c711b374dd03d1c44/jasipipemi.pdfIn PDF document text
    • https://wagaskar.com/media/nivokepigaxawabofokovi.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/3dfc6a7e74fdb4409f12f62c814e77d6/64707313433.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/677308a9e5fbd620b87e46b1d4609618/milugavuziro.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608231778588b---tetezomepokajusa.pdfIn PDF document text
    • http://cephedanismani.com/images/pages/file/salisuzifonuxukepax.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/24129732556.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/pafizosivemel.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bcdc2c56d---semuzoxufulemimeviwi.pdfIn PDF document text
    • http://goref.ru/files/file/64103562802.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/990194789612614bc2071025ada1e315/tawopotefabiti.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb63152f43---piwira.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/c66372c596432aa4e86166eef73b3539/putujeke.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c2a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2A2 18456 bytes
SHA-256: 3d6aa9b06b0f616f254c719cae643830315f2b4b794fefef33556af1e6bef652
font_01_sfnt_off0001f324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F324 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B3B 11072 bytes
SHA-256: 2b670ce929d10bd501a3ef0e960ce0e691e41de99be9cc37efa75a3f18c1ee0e

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