Malicious PDF — malware analysis report

Static analysis result for SHA-256 d59bb2a0c4d97298…

MALICIOUS

PDF

74.1 KB Created: 2021-09-25 15:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8a26c7b0749224b016e1e5bfe95e0319 SHA-1: 16375ee716972618b750afbc1e3ee3e0a1aa4341 SHA-256: d59bb2a0c4d97298c1149569583e298738baf97e995c9e5a2c0df256c30f7584
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with many URLs pointing to compromised WordPress upload directories and disposable hosting. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/fa953ed88b0d297e286b3f80b8b3561a/wulumomibebokul.pdf In PDF document text
    • http://hongshengfish.com/uploadfiles/2021091209585340547.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/jijijokavufetifuwijaxiso.pdfIn PDF document text
    • http://tulga.ru/editor/files/45914216624.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/14999310074.pdfIn PDF document text
    • http://mindentudor.hu/userfiles/file/51050126845.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/vemiwitemitegarera.pdfIn PDF document text
    • http://wx-test.com/upload/ckimg/files/202109131400309626.pdfIn PDF document text
    • http://szentdorottyapatika.hu/files/89647759523.pdfIn PDF document text
    • https://aecvfcom.nrgence.com/upload/userfiles/files/70584213503.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142400284d27---wixugeniwid.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/51610060894.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/xukewusivuvi.pdfIn PDF document text
    • https://taumed.kz/upload/2021/09files/210924154734537332pmja7.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109081501581449.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/81119913540.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/37894401978.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe56d26066---wijixodorigofa.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/3b8d85e0c907c4872d3aa380a5b6763c/89891675121.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/2449740165.pdfIn PDF document text
    • http://annabarons.lv/files/files/75288987456.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/lasutuxe.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/labepilimivamukabasi.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135ca73208d7---rimofonusinapesuzipavun.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/vrihv6cudgf25rvmo2doaame0q/ziruguwobazudukokiwusoxiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=neenda+neenda+kalam+audio+song+download+mp4PDF 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_off0000b7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7FB 18396 bytes
SHA-256: 626586a80071e9dbd49cf4503e0f59fbc26c936d5b339e54263ad47ed59f4b99
font_01_sfnt_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCB 10872 bytes
SHA-256: 84de1f3c657e515395f9b1365f30ec1d1dd6915eeb7620c3581ac14ff44243e0

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