Malicious PDF — malware analysis report

Static analysis result for SHA-256 532a3c634c2b945d…

MALICIOUS

PDF

84.2 KB Created: 2021-09-17 14:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a594f59648c194826507f6930b837a81 SHA-1: d08143964b52f7b8494f3cb6513bc43d0b71fe26 SHA-256: 532a3c634c2b945dd3a96b5401359ad6f4756fafe502c320a40a757e46e323e4
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://www.astmalek.cz/obrazky/file/40379938547.pdf In PDF document text
    • https://bczenekar.hu/files/file/tigepigiki.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/lemigo.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/fivogagivusurimituvare.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-7/20210907043156128797.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/niputebof.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/161407af223002---navapuzike.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/27609000415.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/mavitelulimefoluzivewoti.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-9-14/20210914015512114297.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/datoxemarulun.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/8663a1a7e0709b97b23ffede4f721e24/81117079022.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/73920316814.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/45321935434.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/pukujudikavikizebawesutuf.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1613faf67e51cd---wonuduwapevanapi.pdfIn PDF document text
    • http://sasolution.kr/userfiles/file/jijinow.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/lizisefut.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/latajevibuxenapez.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/35595406581.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/39664013800.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/dajunixutotivimid.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/bomebitivuw.pdfIn PDF document text
    • https://dovolena-jiznicechy.cz/uploads/rakabo.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/xexiwotoxuxadila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=wave+editor+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D2 10216 bytes
SHA-256: 73216a360737c02392f0c65ce8d51b95e875012818c0edb614590cb0d3e0c790
font_01_sfnt_off0000fbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDE 18332 bytes
SHA-256: d8a055f227e5e63c239716782f1a11b1332d749ffc50f92b5148e8c686a429a7
font_02_sfnt_off00012b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1