Malicious PDF — malware analysis report

Static analysis result for SHA-256 efdd616a123065d2…

MALICIOUS

PDF

81.7 KB Created: 2021-09-18 01:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fcd26b6fc1b1405ed4fe162d9d51b104 SHA-1: 84f4ee2b5a45ce34faada16296b2050574a87c39 SHA-256: efdd616a123065d24ccc1e38b48669b6b409ac7e41729ee790cda3dd5b822cca
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7655

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://huntic.ru/uplcv?utm_term=test+your+android+apk PDF link annotation
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/0d1bfba3f8afa34f2520fe24f175fd7c/50135728392.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/99731054214.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/zuloju.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/13615213853.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/gumegonozobotawizu.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/voxudijuxetegopogalafuvo.pdfIn PDF document text
    • https://thefertilizerproductionline.com/d/files/midita.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/jojubogusivebuf.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/248f85464901b62a556357b10646c56a/81050971985.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/lenexofimafikarunexi.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/putepelekogudobonotu.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/jedabigixebirazobebi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/2i2elumdslp3pmd33d87074v85/zovupume.pdfIn PDF document text
    • https://abisspaandboutique.com/nbloom/fckuploads/file/59826679327.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/87409107248.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/kudezapage.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdd179660c---dumutases.pdfIn PDF document text
    • http://triple-a.co.th/ckfinder/userfiles/files/maginasotojidopuxa.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/4375002259.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/logefimol.pdfIn PDF document text
    • http://monarchiaerembolt.hu/tmp/2121263144.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613021f598dab---davogubekavodilinepi.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/xilataxun.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_off0000e803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE803 10608 bytes
SHA-256: 4f32253a3416169dde58ca337d52a5b00d4204e2c7433eac0250b3e159e5d429
font_01_sfnt_off00010075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 17012 bytes
SHA-256: b59d15e6df5044756bf250225452cab6a292c5f3036c95962548b35fb2979ec3
font_02_sfnt_off00012c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1