Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5f2e34cec74a5a0…

MALICIOUS

PDF

94.4 KB Created: 2021-06-27 20:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1db5902485782d428cc18a282856347d SHA-1: 8440964d0f467a7041021a6259e272c6b8b6d9b0 SHA-256: a5f2e34cec74a5a0434737ce7d6c0a47a2cb4a1747fa5356797f270dec5a648b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identify it as a link farm hosted on compromised CMS uploads, suggesting it directs users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs points towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609837b89c84d---fufaribamaxinenap.pdf In PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/b4e6cca2e699b7c6ce03c79319f0de76/nizudedowunijamejobesobav.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/30bop521hph4qjmmsiq4rdhac4/fijukuxakuzepor.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/tegegimofudosu.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f1b12ae2b---xirimubediwarifofesuvidi.pdfIn PDF document text
    • http://brooklinehs1964.com/clients/6/6a/6a3559cec3eb17f551da2d864c8c85ab/File/98908200133.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/7642e34d4c2e6a81cd24419201382e87/kojubopivofuz.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/xutumabitepe.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/xewanixonok.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/gedetoru.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/38491027684.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/ig3t7g89r3skrk4t1qcmhgmm1k/30559071258.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/a33223f165c62063cf75a76dbaf1fb13/rijugonafek.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfd00a0055---wojebunajol.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/96ba560c6fe33e3f55056f2e52cad031/bufinimoliminiwasuwugijat.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/21990568562.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/56181636215.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d911c05ee0---runexavusitifofasebit.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fcbb61fc4---6796753322.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/jizamiso.pdfIn PDF document text
    • http://ccapostolicchurch.org/clients/1/19/19d200bce63520a637954fb60b162b1a/File/kilixitagobewig.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/ge2qubgfg873chsusa8k41s9g6/guvinasuf.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160810d907ac7d---91842253563.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c94fb49a0b---46032228583.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/37e3b72f75d08deca28fc26632b7b666/23697423302.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/faberomikorari.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=name+rater+emeraldPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10394 2996 bytes
SHA-256: 6a2cb442cc98072e6993a859ee3567fbda664b271f0895aa51bca87085bccfb6
font_01_sfnt_off00010ff2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF2 17608 bytes
SHA-256: 049d1b48db12cc6697f9fd7c82981c2fad6c8626dfa85f61edcbf0bf88466a77
font_02_sfnt_off00013e10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E10 9904 bytes
SHA-256: 588079a0d26a6acff7510f36a8733a7ab6837ecf751dfc11888484efcc9edc32
font_03_sfnt_off000153e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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