Malicious PDF — malware analysis report

Static analysis result for SHA-256 59357d56fd2ffc35…

MALICIOUS

PDF

80.3 KB Created: 2021-08-28 22:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 40b71a0d437b9a647edeffe44f2c5504 SHA-1: c59fc1b2077ce7b8d6fc01c1b65f5da16fbe4463 SHA-256: 59357d56fd2ffc359a95f3243e1754c81f56ebcc62623bc286f07f4ed2094ea0
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The PDF structure itself is also flagged for suspicious link farming and potential exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://bookblog.kr/data/file//files/77708980937.pdf In PDF document text
    • http://zwickerfoto.hu/_user/file/80700762236.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/eu35si1s4lggvp2tnmead9m1v8/8008854139.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/jebisigidev.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bea0dd08e94---puniv.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4ca12c508---visikavukodudodezar.pdfIn PDF document text
    • https://aedwea.com/upload/foto/92408410476.pdfIn PDF document text
    • https://mimpishio1.com/contents//files/76137141993.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/ridatiwetamewipasabipon.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/nevekixabuwosakoziwemo.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/7628897032.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/78614673835.pdfIn PDF document text
    • https://masihpt1.com/contents//files/jijiroxurusafe.pdfIn PDF document text
    • http://domplus.su/userfiles/files/luwitamusikujerevi.pdfIn PDF document text
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/2449544363.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/33640972173.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/1a52b494e1a730e8dcef695364cb1755/tamolaniwejumemurojalenag.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b2c028f84766e39a615e1729f2070793/92656992709.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf300a637---saxonubipajogowepuku.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/pabofovazajosumelum.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/34523fd1599bb888e1f5935cd04c845d/403350667.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/davogazivirekiketuvuwu.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bb00d4c58---42100757058.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/84969012417.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/gesorutibet.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/e2f63311783a28daee5ed9ad43a08f1d/faxom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=cae+practice+test+5+answersPDF 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_off0000ce2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE642 10452 bytes
SHA-256: fa598f4bbd3a765c9066d33c4fe8d4c568914a28309dbe102af97127bcff41d6
font_02_sfnt_off0000fe3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3E 19692 bytes
SHA-256: d3b8d8f37ba26059a38f483e8a10a239c03652c3725771bbb0ba78dcf43ce769

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