Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a076d526095bf48…

MALICIOUS

PDF

92.7 KB Created: 2021-09-03 20:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d1e6bc5dda84e7d30b103cb4e9854693 SHA-1: 427fe8b03d1b40fb5a3e7c75b117d005a7e5c19d SHA-256: 6a076d526095bf48cf21a473ef23c77d3dd14c43bf7d1cbe33d468decd29745a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many of which point to compromised WordPress sites acting as hosting for further malicious documents. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading additional malware or phishing for credentials. The presence of multiple compromised CMS upload links suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • 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.
  • 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://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/e830eitdun7hdlnb24irehe7n2/ladiwovadozifekugebu.pdf In PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/wewebokosofus.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/20691f424890f78573a4194d3cf8a601/didivusu.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/97518818189.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/587df7293d84d74d00951d11b8ce65be/40387436417.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/nomuja.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/nuxiruwipezobowugosidadix.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/2290a0c729e3bf40d44aac2dda42a307/mivixojalamaxasakom.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/veletunorabil.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/20aa1c6a71717962eace51b87b56788c/21690730652.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/60935769072.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608912e926523---28712884702.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202108220348141856.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/popozives.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7a9e0c290---zepotunikikerekur.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/bivuxadojozojoketivejux.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/60890545561.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/lezevajitokuboxid.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/06dca4f9ceaf9ad926c645c918e584fd/mewejolo.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/0c73fb832a97a2b993bfc68c36af92bf/nekawel.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b43a7382b74---61826105504.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609baae4b25bc---91863754543.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/88629730353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=kalfukura+jorge+baradit+pdfPDF 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_off0000e7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7FD 19092 bytes
SHA-256: 0f3fe5c86483064dc3e8d338981a9f41188a21958e8b8d36fa7015e3b93c65c0
font_01_sfnt_off00011975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 10856 bytes
SHA-256: f747c180945500ecc78a8e42631db8bbbc48d4b950424ab45dd78a7baecab631
font_02_sfnt_off0001322f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1322F 17484 bytes
SHA-256: 30419b581eb97b3ca8db9e637b1f7514c2a49cfc2a9cd84678f8e0b3fd0fa4d2
font_03_sfnt_off00014cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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