Malicious PDF — malware analysis report

Static analysis result for SHA-256 27856162e70a736f…

MALICIOUS

PDF

80.7 KB Created: 2021-09-17 23:30:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 59271d6eabbef8bfb1a01df9fee2d467 SHA-1: c698406443fac9fd6cba464fa31aa635ba427af8 SHA-256: 27856162e70a736f89d24c5936afc3fcb8acae37fa821c56a87a54342da72221
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised websites and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://huntic.ru/uplcv?utm_term=androdumpper+mod+apk PDF link annotation
    • https://pima-alarms.eu/slicice/file/zikelin.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/84865889103.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/051a68127e97fb242f79c952d30ffb62/19844426062.pdfIn PDF document text
    • http://kprmk.pl/userfiles/file/73949830978.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/zigukefebezadejumenuw.pdfIn PDF document text
    • https://hinodanang.com/uploads/image/files/83900176288.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/mebunaxagatozimonid.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/f0706ad036a12806fff9a5fb52424c61/dewowilali.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/veluperazatuxel.pdfIn PDF document text
    • http://emannsltd.com/userfiles/77092891450.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904012333.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/77206533262.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/70648880465.pdfIn PDF document text
    • https://architektor.ru/uploads/file/19340439971.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/neduwejepupitalevalaresek.pdfIn PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/tizibibijugumogawinepa.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/xusubibeseloxa.pdfIn PDF document text
    • https://kaowei.tw/image/files/20210916_022830.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/xijagiragirozunulesireku.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/450bd2cb967f5fc2c068a93ce5fb88a0/52164827459.pdfIn PDF document text
    • http://megatex-plast.ru/pub/file/sifalajukuduranuv.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142b73c92109---4972097604.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ece9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE9 18964 bytes
SHA-256: 47f93c3e8a213f7fa94c58008740f200857badfc8cfc1326c21f347c11613aea
font_02_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 10320 bytes
SHA-256: 62cc3679d8e63059af8094e83e1518e18bdd0478c803afbc2fe5310fe7f29916