Malicious PDF — malware analysis report

Static analysis result for SHA-256 2af62c3d88b4844f…

MALICIOUS

PDF

95.1 KB Created: 2021-07-10 06:17:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 111566b7c7750211e9fd1334a82a25a3 SHA-1: 523f85e31b6673e7e2d5689159a1433ede6bb873 SHA-256: 2af62c3d88b4844f504b13ad08d1a551c8a60ee1195ee3f7f5188c0b4f040ed3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload directories and disposable hosting sites. The presence of an AcroForm button with an action trigger suggests an attempt to automatically redirect the user upon opening or interaction, likely to one of the listed malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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
  • 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.
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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://garglob.ru/uplcv?utm_term=al+fatihah+meaning PDF link annotation
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9c9a808ec76c9646fb622897e590d84d/ditaw.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/kpqcpnmk3rbqru4o5jjfa7dsjh/mirataz.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/f778a8bf8c6f77a952778b06c3ee23c6/juzefumujeloxasadijurin.pdfIn PDF document text
    • https://bloomeng.com/uploads/rabazivobalemekurup.pdfIn PDF document text
    • http://flexa.cz/docs/file/93167173560.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/83169197093.pdfIn PDF document text
    • http://www.buildonhope.org/file/xiloxuxagonowimonivokeko.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/162d2f70d06927c0c232ee3704a31a62/39765997239.pdfIn PDF document text
    • https://majubesar.info/contents//files/14301272190.pdfIn PDF document text
    • http://chromoink.com/updates/file/66866761461.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/lidaxuzinegivawugoles.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a2cd3671---sulerifulojawudat.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/ligupof.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/58289140011.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ec7f38dc---31287268794.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160a52cf60d1c1---27910597992.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/883157aba15d114d9f683a32b9c281fb/serazemo.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ra7a90ofi9j5hc806cqnt96944/bizavem.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085f13ec2cb2---85205616540.pdfIn PDF document text
    • http://honda-vo.com/upload/file/69423664042.pdfIn PDF document text
    • http://www.tekkoo.net/images/library/File/xenipubolaj.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f107.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF107 19032 bytes
SHA-256: 72dc21f0758421e223a6f5c751bd50e50b83a8c79c37a536cb5c009280bc50d5
font_00_sfnt_off0000e887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE887 1812 bytes
SHA-256: 8c28d97cf62a097232635e4b8e87fcc3f43318a36e04f830f8fd0392aec3f02f
font_02_sfnt_off00010f40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F40 18260 bytes
SHA-256: 671a3ee94b7648f7e0ddf8e5fcc082d177e47aa4d5e0eae7acb342be5c565a10
font_03_sfnt_off00013e26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001563d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1563D 10252 bytes
SHA-256: aef9675a20a0ffa68003136661b6f0b6f3670b169564fe3ac94ae5fd6b731218

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