Malicious PDF — malware analysis report

Static analysis result for SHA-256 788382b40d4469ac…

MALICIOUS

PDF

92.5 KB Created: 2021-06-29 07:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0cfadb7d641ab33a88662ed471ab5620 SHA-1: 53d803dc820e76e1d15c94508cbad90d99afc5b4 SHA-256: 788382b40d4469ac1905f3e499acff85f16b09335a6ff26c5ae06eb1906c2394
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, pointing to multiple compromised WordPress sites. These links likely serve as lures to phishing pages or download sites for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0cce9a034---razod.pdf In PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c4b0e935---52231971436.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/75227650699.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/b108552fdc052cc7d0c979f99c1e257e/14046814033.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9c7855587---89518693968.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/okv17sa6k7j918v8lg2oq354i0/14400325059.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/134c0fa415fd003c6004bde9c2928825/talonakazerasezuxik.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d90b4b1ca4f---lerisepanilijukulodamuma.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/04ebcb4abe831881be6e12f79f965e04/vipedavilakuwej.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/valulegopelimukemibed.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/139k5u9q3jvs8ptamql705pgfq/84349872882.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/14697788794.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607259d8efd50---51764835556.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-5-6/20210506113407655053.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/bifegelo.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/kubezuwegawe.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/9f6fca30fde616887c17a512b221db00/84465211734.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4e7e67706---niguzewilokipa.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/dd497463f4f76c03d9f3334dce24a4d7/93817915675.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160860ce42c99a---bejifofin.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cac2dda3154---tanasabusofovedufowu.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/75507c3d4f7a213772e7fd3af5777c94/jerovag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=coad+yourdon+object+oriented+analysisPDF 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_off00010913.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10913 16292 bytes
SHA-256: 63a552854259f9ecd42c1e4ca16b7a5376846766a12b497460c8bf8278cc33bf
font_01_sfnt_off0001337c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1337C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B93 10880 bytes
SHA-256: d9461056561f74177e068c002bc8e6806ae007fca6ee717c5c4d8ae182a186b5