Malicious PDF — malware analysis report

Static analysis result for SHA-256 e829f12ecc9f2236…

MALICIOUS

PDF

152.9 KB Created: 2021-06-29 04:58:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: dfdf7d62180a775b2bc52d49174cdf69 SHA-1: 62e6c5f4d5dce22142e4ccd2267332d264b120a6 SHA-256: e829f12ecc9f2236bb96427b36fd2877de3b46584eb490613afd75755d256229
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9087

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://aaaexpressheating.com/userfiles/file/sixefenisabanovoj.pdf In PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16083188fd8b54---jidevosoru.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/f5nkgb284nobier3giscboblji/pubapilazixifebutit.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/4f47963a3e4fce0bc80339ca4ac0e837/tasuwegugititewabixo.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160749051c4f19---12320319127.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3e402733f---daribomemoditiledux.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/28306385412.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079e9a202458---45906898138.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ac19f6b16e1---3601405341.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a13f8c1a3---tudivuligozojazatuwif.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b2ce597ffe054a915345f70bc5e55455/73606366748.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/pifipusebawajinidakur.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/50158010272.pdfIn PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0ca8a170---wevixokijaramafe.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/dekerararejobemewemon.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/7h8n2s4drstbealaags332ucsp/59859529053.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/rixawiv.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160822d10a5b23---jewurividasiruzizigebef.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/ta1rt75ehulfv62l4j2eeahccd/75480195036.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71bd5eb8825e7e46c4c793852777c87f/sulubogukatemeladexot.pdfIn PDF document text
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/puzowifezilerefuwaxadug.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/b52886226f36030ad90a919065ca99b5/xoraruzag.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850dbcad8f8---80858819769.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/29962686902.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=longest+and+shortest+day+of+the+year+2020PDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017c10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001941e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1941E 21876 bytes
SHA-256: c3dd379fa352b5db4d019d4e63283430439809c5431508b741a84a88297ce844
font_02_sfnt_off0001d203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D203 10808 bytes
SHA-256: 88906b0f430bd8ea0cc73a9c3475cb5679821f0429cec86fbc31df0f2180bd00
font_03_sfnt_off0001eac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EAC9 36776 bytes
SHA-256: adc212f5f8939cca91eaa8e58bde4080aab3c16dfe305dd25dc212572154c532
font_04_sfnt_off000237eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x237EB 18212 bytes
SHA-256: e9b7d85032af9ee17dc1722181892fcb63898e81670477cc3998e8cb68fc0c1b

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