Malicious PDF — malware analysis report

Static analysis result for SHA-256 312f95ff326300bb…

MALICIOUS

PDF

92.2 KB Created: 2021-07-02 07:06:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 2b397109eb3378799cc616a45a0f5837 SHA-1: 45ededd215b703275e7585dcb78f641e77d1a18d SHA-256: 312f95ff326300bbe16775d8b19c74362c912e1efb5f63392bd2a21a15fc2e1e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://growlink.biz/userfiles/file/wepazes.pdf In PDF document text
    • http://nyett.hk/uploads/news/files/pekimogisilifodexelit.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/56177293300.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/dajevaxilurariwaraluxemi.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c00c1e179---84379335144.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/jeposuporezujuva.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/61bce6a9d7f216ab9898d6d2e6b068d2/81773666840.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f1ca880f3---zudaxefikutafumenepaxoj.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/8ecd1ce193f8e5b656453e76c52ad1a7/83828765096.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc1cfc3099---98557773878.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7f99f34b---firifeluduzalosejidag.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/4c3eb9e526fa0904bdec62bb2d83fd36/lilekedomemikazakiximel.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/zojezunumu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34c506677e---23436630870.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb03ac83229---kodeje.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/fopukejuzudosovuzusor.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd3fd7a69e---29209700653.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2a4c9a433---17870378272.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/5062250250ae3f28620dc3764fc75705/64677740542.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/dqqvlmqf1s7crk18qa0r0aa49l/menafowilurima.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/7ov7efc302qf33vgbkh2isf8vv/kalibewekatad.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/n7i2tk9olrngu3hrkc0tsq1akd/89037391684.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30eb14870---32499998642.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c544c11e68b---koduvivawuruzemoxatuxiwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=simcity+buildit+hack+android+apkPDF 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_off0000faa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA5 11000 bytes
SHA-256: 10cd3957d3643deffe592101bf4929d5bc0c39288d9b26d63f0aa843567e3b01
font_01_sfnt_off000113ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113CA 17716 bytes
SHA-256: ae7cdd25f3be7432d0ec2f03408d1ec7ad77f13f711a6f516b41385fde05b63e
font_02_sfnt_off000142a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A7 1692 bytes
SHA-256: 6df00093d1a1fd8b8f95901b42ba2863538c90606311dd4adf1993a433792d13
font_03_sfnt_off00014aaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AAF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1