Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4426bc4eea7bba2…

MALICIOUS

PDF

94.2 KB Created: 2021-07-26 12:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 74631a80195e63cd766fde2a4c73cbb6 SHA-1: 180d934aea52dae54679c40b46ad244e819444f6 SHA-256: d4426bc4eea7bba247502a6fcce45b313d41c82e9ff90c48cdbf0a03e84e18f8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/1hqdbqr2rt5ta2up6ske5djk6u/seveboseratufaza.pdf In PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16098843fcc8d4---64393156387.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e3c12a66b4e20cc57d3813a682535908/mapivefusipiwaluliruper.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/7018bcc20246265b4c88e1a74d600e26/jitiwuvexujaji.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607de7a4dd188---bunapabusigaporamep.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/40792226930.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/zizuwewironadixasazik.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/pagodefedavinov.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/c63f5bc9d5ab3b30b9e4c8a73e4d9bad/92304509384.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/sevaninanekuxereniwutije.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/16660924344.pdfIn PDF document text
    • http://bernardthevenet.fr/ckfinder/userfiles/files/51552482276.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/6d9c7375646d67949ede28c8518d9b2c/83534902281.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/65052153190.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/ihkunpdo3imsbjjp9ojdulqi8v/39825439231.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/ugt41j0jm75heo9h8p507ru9da/likuxakefo.pdfIn PDF document text
    • https://styliststudios.com/imagesTE/file/45579929219.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/bubpdjp9v4brrgeqd7l9a0ppno/56801348413.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6b1f8e894e81d668517a5e188c2bd617/budekobopujivogalasege.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/e6ug0kesn5pot3977rosb95846/vizuzenikaxegite.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/64986638502.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/51608115940.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/mozelikinopovipelo.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b80b97439e1---87736313614.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1159b6bf5---waridegebeguri.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=ppsspp+god+of+war+chains+of+olympus+settingsPDF 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_off0000f328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF328 18036 bytes
SHA-256: 3edeb0df64d4b4e7df20bdd912c19e19441aada2c126a20db8cf99f87089e7a2
font_01_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A4C 11368 bytes
SHA-256: 2b64069376beb97a81aefefe5f2ad772d435c3b5f5f3a51b81201bd3e3b60987
font_03_sfnt_off000154c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C2 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd