Malicious PDF — malware analysis report

Static analysis result for SHA-256 03511be8bf0ccd9a…

MALICIOUS

PDF

95.7 KB Created: 2021-09-19 22:59:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1516fb26ef2a277c11b2c25fcb431cc7 SHA-1: 4e0229c94d1b8551de452cdcccdbb56ed5713caa SHA-256: 03511be8bf0ccd9a6f918f4c8fc7b1137b36cc008e217e73d74d8164b70a10fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to lure users to phishing sites or download further malware. The presence of multiple external URIs and the link farm structure suggest an attempt to distribute malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4250

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://synerhu.ru/uplcv?utm_term=g1+joe+the+rise+of+cobra PDF link annotation
    • http://mirai-kankyo.com/userfiles/files/gotoxomagadubetalejozaxuk.pdfIn PDF document text
    • https://austarpharma.com/upload/files/44132221034.pdfIn PDF document text
    • http://contrast.no/ckfinder/userfiles/files/barosazexedape.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132f21685995---73305048957.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc50440a0---tuxamesivuwumafexemodite.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/26512822257.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/wowewizijukenetafilazipuz.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16133592c7fbfc---bapinunofozunoxubeg.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/38725748268.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/68516963205.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/84400151845.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/2932262804.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/1f435cd32bbf707d24acb432b49b455b/91480284594.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/bowekemosolusa.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/kagaruvidijivakefi.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/pozutasariwuko.pdfIn PDF document text
    • https://curvy.tw/upload/files/91306797090.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xujivigevawekut.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/2988193016.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94faa5aa1---33344283077.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/33392696551.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/86013400054.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/resoferexit.pdfIn PDF document text
    • http://klaaswester.nl/img/file/kokutumabiruvufuv.pdfIn 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_off00011c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001343b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1343B 10644 bytes
SHA-256: 5d4111beb65675bca06df450619e5d55ee4296dbb56949c5adb65d8c4b7a7fdb
font_02_sfnt_off00014cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CCA 18992 bytes
SHA-256: 6a1f9ec8317e3cce4c50586544337a4b5219fcc8f763244ef19a1d9d69364e2a