Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc039015f2e8d49…

MALICIOUS

PDF

70.2 KB Created: 2021-09-08 23:42:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0cd23699b216f47cdcf19de97898d78f SHA-1: d2fe90ff3736562fbd45d7989c93adf55d054d69 SHA-256: 1fc039015f2e8d499f07712d1cdf2476d56eb797c7ead3d53f1b0638fb292693
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to compromised WordPress sites and disposable domains, indicating a link farm designed to redirect users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or trojan distribution intent. The presence of external URI heuristics and link farm indicators strongly suggests this PDF is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

Heuristics 5

  • 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
  • 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://laborke.ru/uplcv?utm_term=the+haunting+of+hill+house+torrent PDF link annotation
    • https://drjou-vc.com/upload/files/padugujofiwexabuduze.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/zunurugotujoguxop.pdfIn PDF document text
    • http://isgsrl.it/images/file/67173327936.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cf6353c3b---21504216152.pdfIn PDF document text
    • https://vokalensemble-vocembalo.ch/userfiles/file/verunifizavagiponibi.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613510829d4e2---zusumofijutikupakumejeje.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/41918372611.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613227194f967---53484308354.pdfIn PDF document text
    • https://aneri12.cz/res/file/5684295080.pdfIn PDF document text
    • https://equinox-e.com/upload/files/70358681140.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/futike.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/65389717483.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/zunerajinexi.pdfIn PDF document text
    • http://centrlita.ru/archive/image/file/ruguzipobevavul.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/62789941829.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/58671788594.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134db85b0159---xisajenijuxex.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161317ebda7a81---43003556242.pdfIn PDF document text
    • http://debten.net/UserFiles/File/1534421652.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e8650dbf5---moribowekegexaluzawo.pdfIn PDF document text
    • http://samtle.net/ckupload/files/mijetofopegesul.pdfIn PDF document text
    • http://oletrans.sk/editor_uploads/files/70560492369.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/bowagixajex.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/15724190304.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4FD 17776 bytes
SHA-256: 6f07a60be1c1d1e168106c0afed7739511202fe842e60f9f7f871bb37603df5f