Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5b4ee5e2e836d65…

MALICIOUS

PDF

90.6 KB Created: 2021-07-16 03:55:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d8fc3d29b93cb3bfced70d3af43604de SHA-1: b5654c57260b5e51e43d6d9716883c4854b6acaf SHA-256: f5b4ee5e2e836d65831731665353341a63a4655282134ea9ee16449405ed1264
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing. The presence of external URIs and link farms suggests the document is designed to redirect users to malicious or phishing content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=tyler+florence+pulled+pork+oven PDF link annotation
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/3ed6a04fddbf2b4d2ffe95896d25dccd/kixuni.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/94427727429.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/lizugutuzamunuma.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16077d84dbfd14---kokozasexix.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/43250b7837569e658772062792275467/rinanofa.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/manugoj.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/mobegajezige.pdfIn PDF document text
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/3391988885.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/ba186abae37cdf619be55fe78c4dcb11/15392960991.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076f4644fe14---12617229519.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848effa7dc3---bobez.pdfIn PDF document text
    • http://cjandjunemillerfarm.com/clients/75830/File/34590550186.pdfIn PDF document text
    • http://baovephuongtroi.com/vietkiendo/upload/file/vidun.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/9648361bd099d412bea9e476906f1f12/toxodigumemomugowawubam.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/fodasog.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/jawupukapizavovaxamonibu.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/17430731797.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/7484853a3237dfa8d9251cb4c240081e/jedewajabe.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/vegogonapif.pdfIn PDF document text
    • http://bjaimama.com/data/upload/2021/05/file/202105140534484380.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/xajipokidadom.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1378f0b5d---57073849468.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/zixevatut.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD59 10428 bytes
SHA-256: 1687da465eae4b8715b03234fd9a40801cf7500897c66a9c0e4f9ed5885fe7a9
font_01_sfnt_off00011523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11523 18176 bytes
SHA-256: 3219a65add76e28e8aacec6ccb8fae4b5e38f8bc702346942bf1e789ce6bd541
font_02_sfnt_off0001453d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1453D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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