Malicious PDF — malware analysis report

Static analysis result for SHA-256 77e12b122c2db069…

MALICIOUS

PDF

96.9 KB Created: 2021-07-12 22:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c792d0d83ecc717919435f8066f305fe SHA-1: 2c674c225159e9aaeb05d5f066ef479099992109 SHA-256: 77e12b122c2db0698ce5c446cfd4c375564156c3782e8bf1a5cc105af7fe64a4
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of external URIs and link farm characteristics suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

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://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/35433359272.pdf
    • https://brahmagnanam.org/fck_uploads/file/ximotegibosi.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1609a33d681f2a---71777369583.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6um0hlab808s4bk4t4i72ob4sa/84710977378.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e950d1b1c---kusulukowinakikok.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/8fdc036d1a803f91fad56d706b81adc4/zesekomusegi.pdf
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a85bbddc903---17176378899.pdf
    • http://golden-candies.ru/webroot/files/files/51672876181.pdf
    • https://www.medipratik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc83b64ded---29884041797.pdf
    • http://files.ibiza-ferien.de/file/7120226688.pdf
    • http://toyteepee.com/uploadfiles/file/210517195342772754x2wwk7.pdf
    • http://orderkiwicafe.com/uploads/files/xuwokurafedopafewudimitum.pdf
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c7818924e5---vixakadinivokogomenivupus.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/q87812ko7ul9aot8b0c5f4ut9d/553461412.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca19f1646---46164938445.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ffc37dd5b---14004705690.pdf
    • http://schokobrunnen.com/idata/jezati.pdf
    • https://songhong.info/userfiles/file/baditotimepirugaviv.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/3100641af2203761097169f7ddba130d/20886972102.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad60e5d5a0---gowexonozezujo.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078aba412db4---6962023675.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094751212393---retafaxawitokugupufubeg.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a97cca279d6---32039160824.pdf
    • https://csodamalom.hu/files/files/tisawadelu.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c807938f9c---xafupofida.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=concepts+of+programming+languages+solutions
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc34.bin
f4390915f1434aafd60d948e69af9a7747af1d0fa50f055a5469231335e45877		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC34 10956 bytes
font_01_sfnt_off000115a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115A4 16792 bytes
font_02_sfnt_off00012db6.bin
ff0424a035d658ced395f7ba0e9a3c4a8794235e8d7ec73e06300dfb65b512a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12DB6 18148 bytes
font_03_sfnt_off00015d7e.bin
439f91fc52918ec11de7c10fc66f42d556e3ca0baf24f0cec7590a9fe4e8f18d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D7E 16392 bytes

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