Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db4f358ce1d0da0…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 04:34:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dc3cc2be51ad890025f00841453b87ad SHA-1: bdb7333ef83c4258a2b3ecddddf2b383f3bbdbbc SHA-256: 2db4f358ce1d0da0c05398b91c75222d0756593d5cb322f2d881ca38f1f0c6b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. An embedded JavaScript stream was also detected, suggesting potential for further malicious actions like downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://prime-standard.com/piceditor/file/remikejagejada.pdf In PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/xoruxomewagesitagotalukev.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/30528004004.pdfIn PDF document text
    • http://baoveantam.org/upload/files/71199999855.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/lavuri.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/texekidurugeleki.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/35606088508.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138372b95774---135706460.pdfIn PDF document text
    • https://musluogluotomotiv.com/upload/ckfinder/files/dalade.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/zodudalojofarovakek.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/5dc78bcbcf50ebcd242aa90b675a5c20/lofegiraxarezolerebo.pdfIn PDF document text
    • http://packturf.fr/files/48641406781.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/xowapimi.pdfIn PDF document text
    • http://bodemveenweiden.nl/bodem-veenweiden-img/pitejewiwuvoxax.pdfIn PDF document text
    • https://kottayammedicalcollege.org/CMS/ckfinder/userfiles/files/71204309695.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/jolumufakimubake.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/lulubirefuvonikisudavevo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/80jgtrsmaj98l0m0qr8fthk338/wopasataxisakatola.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/79559042792.pdfIn PDF document text
    • http://hueide.com/upload/files/64921257820.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/bc85118b6c60ea2edb7677df42ce7d7c/fasuxiviwasetuko.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/lulosujiv.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/revupijiduja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=whatsapp+notifications+on+lock+screen+androidPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8B 14560 bytes
SHA-256: a4b6ad9a3ddfbc89de376dd2be4248da19bfa2038c4da90aa404194f79cc56b4
font_01_sfnt_off0000d320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB37 10804 bytes
SHA-256: 592bf6c1bb1a49dab02bf41ce7970c22661d2822769c14a768be06676ae817ee