Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddb3179090a8bc4…

MALICIOUS

PDF

84.2 KB Created: 2021-09-12 10:55:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b588b9751b681345bc174d14e2e7565a SHA-1: 3be23013e9449cff6ad6bc36a7feffe802e39f89 SHA-256: 8ddb3179090a8bc45bee62e0055a61003e119af83471dc06d7580c831843f626
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious, with heuristics indicating it is a payment redirection lure and a link farm. The document body is heavily obfuscated, but the presence of numerous external URIs, some pointing to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://cuacuonanbinh.com/userfiles/file/4019731941.pdf In PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f02e762e7---gapodorovujewozifap.pdfIn PDF document text
    • http://sireny.net/share/files/japofiminikidugafuzebezi.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/43270110663.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/userfiles/fichiers/miwewomiviweluxanajesax.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/kakif.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/12677043781.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/jelegopubu.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/letuxiterutolipabemidi.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/25692655434.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210909170645.pdfIn PDF document text
    • https://emenu.hu/editor_up/80065689840.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/pasodef.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/38525695967.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/lugivomadenenuzogafabubug.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613c474c3552e---5439393750.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/81968817521.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/pasazaximezel.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/eeqdvhln9eqr5hf7fl1av9nig1/68723739348.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/luxitakajovux.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/70c51d4d6e089c1bc3a176b40104a81c/88573844539.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ecca95ad5b8a37645af63283d8bd12f4/nikaxeloxan.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/polojiboxapufedixopid.pdfIn PDF document text
    • https://posetili.ru/userfiles/file/jukerojaputolijaderoxiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=how+do+i+transfer+contacts+to+new+phonePDF 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_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 10748 bytes
SHA-256: 4afc9b9dc23801e010e8d4e9d19472d92bc5ae989e9676f96b2d368bdd8680bf
font_01_sfnt_off0000fd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD07 17856 bytes
SHA-256: deea5bf261b1dc31062f8645cfe1b2c5f44ce9bf5611cbe4c24a8cc1ccdcba8e
font_02_sfnt_off00012af7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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