Malicious PDF — malware analysis report

Static analysis result for SHA-256 35acb674c8bcd317…

MALICIOUS

PDF

90.3 KB Created: 2021-08-03 13:10:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b04e9b9d77292a950e81b13a7dc5488e SHA-1: 3e6892556bf0b5d9fe52f500f938b3b4affa63f2 SHA-256: 35acb674c8bcd317571c060a7e318be999b15e9fccebaabd67c908f54dee3736
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it is a link farm pointing to compromised WordPress uploads and disposable hosting, with a specific rule firing for a 'Payment redirection / bank-detail change lure'. This suggests the document's purpose is to trick users into clicking links that lead to phishing pages, likely related to financial transactions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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://queure.ru/uplcv?utm_term=prank+call+ideas+for+ex PDF link annotation
    • http://thanhlapcongtykiengiang.com/upload/ck/files/ninopufiwuwoja.pdfIn PDF document text
    • https://ibericadearmerias.com/file/wipepatosawu.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/ranok.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/pukokubapemepalogufedaji.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160f050380a9f3---31900100570.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/vifesiguvunadexeduted.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/65937389600.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/99651925451.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/fapuralatavegewigiveteve.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160b9da1f33af6---2179433176.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/82461812887.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/gapedu.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606c937c24da4---regifomirexizasesuzisij.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/dedigametiligejasili.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/8aced0ce45d4b5f74021448ee0316dda/56860420479.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160d26d4456728---kisomaxabijobadirigipa.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/85198005515.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021080111191831.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/vq0bfn0k18or71rf6c47hde4a1/47660415979.pdfIn PDF document text
    • http://summithigh75.com/clients/867147/File/93586690664.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ace47f6b158---dumadokurusosijilazuf.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/50464786466.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/crm1nh78lvo9t6hhtof0du9lfv/32385219179.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11350 10568 bytes
SHA-256: 381894fe6dc49b692b43d4748da505594120b74a06c86432c733123e5123cec5
font_02_sfnt_off00012b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B85 17976 bytes
SHA-256: a3c461fee2b760bb0e546387b57a36ab913506d3f864cbe6aa7e83251f8a81df

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