Malicious PDF — malware analysis report

Static analysis result for SHA-256 8398e37e5213e064…

MALICIOUS

PDF

69.1 KB Created: 2021-09-29 01:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4df43726df377c68cd680e241bcdd869 SHA-1: 4a3e2372e6b927d70713d02f3ce3acbbc93d69a0 SHA-256: 8398e37e5213e0649f650f693dcffe8d1a59062ff16154dafb08759fa1145942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. It contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting it functions as a link farm. One URL, 'https://inwebjor.ru/uplcv?utm_term=how+to+make+an+ios+14+home+screen+on+android', appears to be a redirector. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://inwebjor.ru/uplcv?utm_term=how+to+make+an+ios+14+home+screen+on+android PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161324aa55bf52---bafawininuwosokofumapus.pdfIn PDF document text
    • http://technocom.pl/editor/file/15860130496.pdfIn PDF document text
    • https://siemreaptraveltours.com/userfiles/file/gerida.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/20335417740.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/6b0e201603934f3354d07e69e903b193/rupexobejiwagisasuwezo.pdfIn PDF document text
    • https://stockbauer.hu/uploads/file/75886151441.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/tanuninowiwetawomijewiji.pdfIn PDF document text
    • http://rayanchem.com/d/files/gokat.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/xikixerutekaf.pdfIn PDF document text
    • http://defhjdrjioo.friend-match.com/upload/files/gevenev.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/84806704017.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5v0q3vq8ub7ho13hg7i32ub5q8/kiwaxulubipese.pdfIn PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/sarumabija.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/gujudipef.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/rujikaniwijasupulifijuxu.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/zijetorofuwejadomezolu.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/1c0df02c6272062a2968d683e73500ac/tedibatoxitewavomab.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/88b2bc12c5019c58d078a8ef684ce61e/23962960048.pdfIn PDF document text
    • https://ecohort.com/userfiles/files/37979547403.pdfIn PDF document text
    • http://areopag-group.ru/sites/default/files/uploads/88349623657.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/mezenu.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/venodidorisineke.pdfIn PDF document text
    • http://cathugo-yachts.de/res/wysiwyg/file/danikawuxevorapalives.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/demiwurufoze.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/zopiboj.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_off0000b055.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB055 10888 bytes
SHA-256: 17643e68bed0ec8d2107fa8d2b588caa4edc0e67537a1eba329fdb1f4f3fa65d
font_01_sfnt_off0000c970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC970 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE182 14924 bytes
SHA-256: e3c2ecbe434e6496662fe6706fe07896c0b761e293e9eab54fa691155a0d652f

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