Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1f080688b4909e3…

MALICIOUS

PDF

82.0 KB Created: 2021-09-03 07:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 566b50494740b6f7614cb73ccb642825 SHA-1: 48761a0a05bf63b8ab824248115c9f2ddf11460b SHA-256: d1f080688b4909e32ef493d182c4e4343eae3cb35013035eb8e02604971f09f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded URLs and the nature of the heuristics strongly indicate a malicious intent to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://cl-metalparts.com/d/files/94920433253.pdf In PDF document text
    • http://langeline.com/ckeditor/upload/files/nirijejujirosutunop.pdfIn PDF document text
    • https://profesa.net/userFilesfile/xumuroxewoxosusuj.pdfIn PDF document text
    • http://ekolojikweb.net/upld/userfiles/file/dorokisaz.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1611da3f5b7e3a---derevinuja.pdfIn PDF document text
    • https://scapetime.net/images/website/user/files/6154590211.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/38538826513.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/49611672407.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/83804124124.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/gmg7op6bvhg09e58ra8smff3h2/jololo.pdfIn PDF document text
    • http://maudchristan.nl/ckfinder/userfiles/files/wivexutiverivikowerit.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/duxiwinawutek.pdfIn PDF document text
    • https://bikeid.net/ckfinder/userfiles/files/tenixawa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/89971197983.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/c7d05e5bd9584258eebfe0b18f73b4fe/27885008179.pdfIn PDF document text
    • http://jarosi.hu/files/file/laxuwofolijinokubosivu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4aa5e28f7---dowisamunobikikaresibom.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/36680045047.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084597b44562---naxusavujozegifeker.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a20fdac532e851c74e33cba53eaa0ee1/voxuzege.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/40000791245.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/f9dcbaaf8382307a9f35f725c353f8b3/ziladaruzusojok.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606d00899e270---97210451056.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8622m9ea6bepftitmplpatpmu7/83704529119.pdfIn PDF document text
    • https://siriusdynamics.com/assets/uploads/files/maxaxozowovim.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160d20ccbdfe98---favuxewen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=imbativel+livro+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_off0000dab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB6 10544 bytes
SHA-256: b4a3e180812125c424e1c58d45794ffe7c73908c163f6bae6d5374f48d47df8f
font_01_sfnt_off0000f285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF285 18600 bytes
SHA-256: d491ed375f775105ec9571d7853dbd65e1d0d519c900df0efcffc4f348c6fa2a
font_02_sfnt_off000122af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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