Malicious PDF — malware analysis report

Static analysis result for SHA-256 240bff3996513deb…

MALICIOUS

PDF

77.2 KB Created: 2021-09-18 02:37:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c55b3b0d1a13269761e744da5b431361 SHA-1: c5605304f787d693fd154d089b829f5d743b2dd2 SHA-256: 240bff3996513deb77ccfd75cbc81009b374ab54edcb57852d03e3abe4eb1575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. One prominent URL, 'https://smidgel.ru/uplcv?utm_term=download+brawl+stars+new+version', attempts to trick users into downloading a file by referencing a popular game, which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://smidgel.ru/uplcv?utm_term=download+brawl+stars+new+version PDF link annotation
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/wamakugejedaremizuduvo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411d4d3b46d---67424133077.pdfIn PDF document text
    • http://cx-gl.hu/images/files/20338886763.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/xobisagerebazopalaxad.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/xanimakokogekixapu.pdfIn PDF document text
    • http://capri.lt/userfiles/files/kuxogexufekirevefikaw.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/gizevozowofaxominoxefiz.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/92147624229.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/fakas.pdfIn PDF document text
    • https://turdv.ru/SITE/files/editor/file/zesavofokegekefefor.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/zopazupomowebusopuvotedeg.pdfIn PDF document text
    • http://gdgom.com/upload/file/2109050151377549633jw3mim7m2gp.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614430346cd40---fufaxuwujiresakolop.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/e1ef2eedd7d6a4f8d19f352cbb9e87f9/6524116411.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa63470923---44589900146.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394eed84cae---tafotagomo.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/90999737261.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133c13a0f76d---manogezepi.pdfIn PDF document text
    • http://askaudit.ru/price/gigolexafuribiredamilud.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/vilitawujudawosi.pdfIn PDF document text
    • http://slstudio.it/userfiles/files/68194329240.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/vudedino.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/66240436312.pdfIn PDF document text
    • 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_off0000c5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C5 19228 bytes
SHA-256: 7b2adff538748d061af2f6856894162f0ecf0c07c3c0e372ef69c21ff1ca2cd9
font_01_sfnt_off0000f695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010eac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAC 10536 bytes
SHA-256: fc3be3fb1b5252d9cffa346033a4de5904aba27e36e76b20d423e727b198bc49

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