Malicious PDF — malware analysis report

Static analysis result for SHA-256 e78c47832262f331…

MALICIOUS

PDF

78.8 KB Created: 2021-09-23 11:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d9530e9a9c7dc8c325638580c0229112 SHA-1: 8a4453e6a90adefb092d1c24331288bbb0c59023 SHA-256: e78c47832262f331d728ca46686d88d8cefce6339b31ec96abf4d5db2f2a13b6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents.

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://nepaltrekkinginhimalaya.com/assets/userfiles/files/28712051085.pdf In PDF document text
    • https://mylin.in/ckeditor/ckfinder/userfiles/files/34176424040.pdfIn PDF document text
    • http://ydchem.cn/filespath/files/20210904175749.pdfIn PDF document text
    • https://apteka-wratislavia.pl/halatecza/userfiles/file/luvidorafabogakazexun.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/gmb47s64jbd4iuhu3m1cmv7frm/23295672731.pdfIn PDF document text
    • http://laxycoffee.com/upload/files/88149199336.pdfIn PDF document text
    • http://mskgroup-spb.ru/upload/file/tunajuxixulugudep.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/26737933890.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16141b329b53a0---rosakadosojirun.pdfIn PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/kenakotefenejipe.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16143641b01631---97650968008.pdfIn PDF document text
    • https://www.aillant-sur-tholon.com/ckfinder/userfiles/files/40636455386.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/57488918144.pdfIn PDF document text
    • http://itps-group.com/uploadfiles/file/solezerovitofoxoxagu.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/65786235433.pdfIn PDF document text
    • http://vipdiler.ru/files/file/vubimezabokawuwavijovagek.pdfIn PDF document text
    • http://youil.org/userData/board/file/titazobisidijemuj.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481bbbbe3e7---9444552644.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/bumikelodikugeluzipaxix.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/78196123304.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=pokemon+defence+towerPDF 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_off0000b0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CC 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_01_sfnt_off0000c613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC613 22552 bytes
SHA-256: 84424476e0388575340c8a731deca02f310ddc8f6c5e4a5dbc7772a58378d5fb
font_02_sfnt_off0000fe04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE04 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001161b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161B 10348 bytes
SHA-256: d96f71d1d7cbd6ee909439bb5a108d92b3038d3fbe6c319447004e4260f805d7