Malicious PDF — malware analysis report

Static analysis result for SHA-256 37030317b1ca7661…

MALICIOUS

PDF

78.5 KB Created: 2021-09-07 19:25:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ee67c0b0a1ca943568dd26a11f3c6689 SHA-1: 51ad86e85cc677a275dd6b8d3de9b91b900e5766 SHA-256: 37030317b1ca76618f41055cd4e8cc78ea710481d29f50367a1204a3d7c633d0
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to lure users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f5629259182---mumifufubasubar.pdf In PDF document text
    • https://armagedonspedycja.pl/files/file/44539438380.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/82470119274.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/88951133678.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb43def03---1099064831.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/rupumeneg.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/5b1277960686c3b32617de3b8b208f29/zekatukelenowanujajoben.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/3202577941.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d796ebb5---lapaxedikuzar.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f199a7c644---jirilumumoduseraranirevip.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/33785235140.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d4819a3fb37---rovupesapedunu.pdfIn PDF document text
    • http://giga.sk/storage/file/kijegazoselafojerasudofu.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/c26ef77fbea728335942317f6f3b2b19/rusuweriseruketobikora.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/mimovilupusarapiwafodaz.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/lolafapox.pdfIn PDF document text
    • http://bonsaichik.ru/images_uploads/files/kimipokigi.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cecfa090689---xitirubu.pdfIn PDF document text
    • https://lordoptika.hu/files/files/pokurabiwalo.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160773e9af1923---josebukirepokafa.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f7c561f0b---jikedijajexapadoxesona.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/fubidimiwa.pdfIn PDF document text
    • https://whiteelephant.co.in/wp-content/plugins/super-forms/uploads/php/files/63387f1612b86c59ed6af4e44fa99e02/merix.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/48837754479.pdfIn PDF document text
    • https://renetravel.ro/images/files/15532276117.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=download+free+pdf+books+medicalPDF 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_off0000cf28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF28 11000 bytes
SHA-256: 7b8b9bd43d09dc732f2ed749e605d2ad75ccaf2647f453a0665f6aae4dd0da6d
font_01_sfnt_off0000e87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001008d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1008D 16984 bytes
SHA-256: 220b96423b7d13457fea308f03aa01fb8cd54491d35776bb1f7de31ebcf3a3a5