Malicious PDF — malware analysis report

Static analysis result for SHA-256 86f28a6431d18a74…

MALICIOUS

PDF

96.2 KB Created: 2021-09-07 15:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: 8da2489180514c01cab937e8cbd769e0 SHA-1: d735cc5883cf8efcda7222eb40feb5b6b0ae61d0 SHA-256: 86f28a6431d18a7469c97db16bb36c121de335faf0b1e1359505f2fe95fd5b94
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to external resources. Several of these URLs are hosted on compromised CMS uploads or disposable domains, suggesting an attempt to distribute phishing content or malware. The document body is unreadable, but the heuristic findings strongly suggest a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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
  • 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://reafamily.lt/ckfinder/userfiles/files/18425197728.pdf In PDF document text
    • http://gillsandgeckos.com/userfiles/file/rutavumufurupedose.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c85b3eea9b---wedidanaferesufutenikul.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/60853585395.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105240937421539.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853665d0aa2---63783548652.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/46927502786.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/mimakamijalir.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9260a45cdff17c80e23b2e8f49a488d8/mofoposotukotis.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/jiluxiteporevapetuxepok.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/41d8e2baa670ecd40c91e39ef9a904b4/puzaxekenimurikemifa.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/pk05afusd8qvsbj2bii4hhk7s1/291442125.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/6ba0b814f264671fa8951eae76991288/42425530704.pdfIn PDF document text
    • https://citronel.com/userfiles/files/10632809048.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/87081534975.pdfIn PDF document text
    • http://architetturaurbanistica.it/userfiles/files/52549033531.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/eal37um9t9qjab24h0tn43mp14/famugesedodev.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81da2942b0---85584779584.pdfIn PDF document text
    • http://robwalker.net/fckupload/file/28931197896.pdfIn PDF document text
    • http://dyglas.com/userData/board/file/tijimepapumalinozedu.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/71744345356.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d315807e3---17390944924.pdfIn PDF document text
    • http://tecnoservizi.com/userfiles/files/vipukoririjesa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=invisible+man+epilogue+pdfPDF 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_off00010f91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F91 19656 bytes
SHA-256: bcc99f96b9af303b3620a78dd7f790f312f9d654d92bc68414ccb3389dc0b973
font_01_sfnt_off0001421e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1421E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A35 10900 bytes
SHA-256: 2f129724c04ee0baaf1dfa41b2d74bbc2949746975bf1343bad79194a642b208

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