Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf880a61d91a2f1…

MALICIOUS

PDF

88.1 KB Created: 2021-06-28 20:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 25a57cb7cdaeb919fe24a10370a6187e SHA-1: 12b93e31700b3408700dcb46c0ce1a496e1cbb45 SHA-256: 6bf880a61d91a2f1443dd93258c1dbe76e9858f17aca12f96280599e638aaeb6
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content. The presence of multiple unknown URLs hosted on these compromised sites indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608667e26bbf4---18687433392.pdf In PDF document text
    • http://thebrownsfamilyreunion2008.com/clients/81208/File/pobuzuvazije.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e3142048---65627567331.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1608ce246b267c---wetadutotogisonixufoputit.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/493b82bb00aa82060ef6440bb4b0a7dc/26043397995.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/7c292eb68682ab3e433b197559495583/79485533347.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607c86bf16748---fimanodegarenorasavape.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbde90de0a---xenupo.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/lr6m8qmqgjuop9rqg7f64bj2lq/kufunamifamegewazilomi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091b68a5d479---zunepitotowugejutomefoz.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f485f87f---xurukatenowopelabutamef.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/3718739285.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/ccd5b45244524fb7445471d4523bde0f/12942964869.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u2oaseug4fijsq1be16dcv4ogf/14184064554.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606c78fc4f853---sexitorukezifojasoli.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fa6umiksbapoefv4ou4dbpfd4f/wuleduvufukeso.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0e5aee6ab10f1c0fbf6d7f4ff426e797/540676388.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/51781216056.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0b839eefae6d84cf42172589aaf8db39/59529551427.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1ea5cab7bb---dejibe.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7b6de7332---62313266431.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/3bb810f64268d4571b7f6c97bfb9610f/38307470440.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/3d0cfad34af5b7358ad4437a7f6dac34/xugowanaritowasujug.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/41923056515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=diphtheria+mainly+affectsPDF 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_off0000f652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF652 10740 bytes
SHA-256: 4a55be7c31b4ef1b0c2acb603c0801ed089eee0002e8b61d43897931e5213053
font_01_sfnt_off00010ee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EE5 16916 bytes
SHA-256: 6eb93884369ee0419a65b3821331f82036b6cd4b6ea35eb11be6c450962f0d45
font_02_sfnt_off00013b2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1