Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e0c5798330ecb93…

MALICIOUS

PDF

85.7 KB Created: 2021-09-17 04:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 70aac2492c3af59a4d0ed79091ee2c4b SHA-1: 53f883f069c0b1ef92fcdc215cbefe1c25affc28 SHA-256: 5e0c5798330ecb93ece862cc9aa787994ccd1cc993770fa0bf34dcfc733d4390
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the nature of the heuristics suggest an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cructi.ru/uplcv?utm_term=dale+carnegie+books+bangla PDF link annotation
    • http://bellamy.tw/uploads/files/202109070848556441.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/35949503500.pdfIn PDF document text
    • http://tentauto23.ru/ckfinder/userfiles/files/79957329680.pdfIn PDF document text
    • http://mgrima.com/files/file/raxuputezufe.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/58573089225.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0f7b097e0---dujew.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/zuremibiw.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/75023300028.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/11047579951.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/busepit.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/pifutitozimibivup.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/temilepezijovelod.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bf91473c9---lurafajomabajuvoxa.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/futesome.pdfIn PDF document text
    • https://mimzyonline.com/userfiles/file/tulitonotefib.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/53779671943.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/d9qequckdaqbnkmt4fcq4pdq3n/59486879347.pdfIn PDF document text
    • https://www.medicalbi.com/ckfinder/userfiles/files/motibigofelijuzujeguxun.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/gotetuwokoga.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/bemopadikibufivas.pdfIn PDF document text
    • http://julianina.de/upload/file/gofor.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/30388378273.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/famaw.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/dasalivonizurefudomugonim.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/zelubi.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000e084.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE084 16540 bytes
SHA-256: 0db8fcc5fc2db11d399f483560f3b659f84c7713f34748c34acc74453eb98634
font_00_sfnt_off0000c86b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86B 10540 bytes
SHA-256: ce7f97ca11517d70be0811c5e8a5a58d74436b04dc1479c114c9b24125b3d7bd
font_02_sfnt_off0000f7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 21292 bytes
SHA-256: 9b25801175de9ff2f26b39a93ad2e655fd638f4f7f0708ee63bddba76e442806

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