Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d353393ee643d33…

MALICIOUS

PDF

67.3 KB Created: 2021-09-04 18:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 33e253398e70513e6fe758512915c795 SHA-1: aa050fb120b00e9d49faefa7fd1e04806e6605d7 SHA-256: 7d353393ee643d33b22d4fc475fc2483079b75492e5e597eba930a5bb7b3ff24
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The heuristics indicate it's designed to look like a legitimate document but contains numerous links pointing to potentially compromised websites. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to redirect the user to a malicious site for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://manhchenang.vn/webroot/img/files/supizemiru.pdf In PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2675b878e---susopiwumafad.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5fa2a3b0e---4260664716.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/47953976932.pdfIn PDF document text
    • https://lotteppta.net/beta/assets/file/vazefotix.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/074caa1caab97e3ad2659257bce2c805/pizoxolilavigokakufe.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dcc1afcac6e---56626193357.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/37507126076.pdfIn PDF document text
    • http://naszymsladem.pl/upload/file/22345599641.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/akrskrjlnpifeeknsrbfc0rc2e/zikukarolegatomixunu.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832e13da82d---lovip.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vatifi.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/41326972089.pdfIn PDF document text
    • http://korvet-sp.ru/userfiles/file/melokegugenoverowojoni.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/penotisipa.pdfIn PDF document text
    • https://tekartltd.com/upload/files/67022547560.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160713cd334a73---72924875217.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/25089624537.pdfIn PDF document text
    • http://cuacuontoanthang.com/media/file/66126738685.pdfIn PDF document text
    • http://nordicaluminium.ru/userfiles/file/51652855343.pdfIn PDF document text
    • https://aksusu.com/upload/files/limiwijigivulo.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/tadatelof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=philips+air+fryer+recipe+book+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_off0000ac9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC9C 13788 bytes
SHA-256: e7fd001df9a351c092ee57c2e9fb89c170d653c4f57f533924ac88043f16dc81
font_01_sfnt_off0000ce96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 10864 bytes
SHA-256: e0a12bec1188943990f24a23edb0f5efcda42d7a5b4c0cdc911bca9b53397ce8

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