Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9063285362063b…

MALICIOUS

PDF

91.8 KB Created: 2021-06-26 00:07:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 86bc3ddc00c127198bc6210fdb0b196d SHA-1: b8fcb2f675561f60ace269b56db55a0584935587 SHA-256: ef9063285362063bf9fb4600a6f29ac7c50b0b07c0f32af32ccf7b7621305b22
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bf459a67d1b---nofuxatem.pdf In PDF document text
    • http://forter.vn/hinhanh/file/xatazidijiwatebutu.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/muvukamilisinekis.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/44062193421.pdfIn PDF document text
    • https://motty-etai-sharon.com/files/files/kinusebuzezatobiwogevim.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/364fc2e35dac6c2d32c47076b1a10158/79204247497.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/ad79e10c6528421d33459db8ae939a13/99203656190.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/72dc52fd429726a0c9b3488c04172e61/60798787686.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16075e88837567---46385650342.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/2qs34vevsevmnsuaf85t2eqea4/54705514097.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7153c704988ce9f5a4a96bfa14dc7498/88493600509.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b409d1ce979---5294666330.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/fd519a67b55f5e1ce73f6417ded04e0a/rivapanebedil.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/17229304470.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/53693369140.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///mutirogixarakarakanib.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/c9984f309b0d43cbc9913324d20d3bc8/40770470629.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0808803613da77a4fb6baeaa45fa3923/sufijoxizuragagaxineba.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/pebij.pdfIn PDF document text
    • http://maxkbm.com/clients/2/28/28fcaa936e2ecbeb6c9a97ea0f1ab253/File/befemavekibumaruno.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/d350c59aae2f05c01d53741ff2a93dfa/zusikanufawoxigutevijus.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607fe7788e60c---pikezezore.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/2gr8d2absff6bk8a17fcha6maa/zupozavagena.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/mg2f0jmhvag4mcodffi4nph2rj/savupagusefevaduperobefuk.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/33773883039.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=the+rational+male+religion+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_off0001025e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1025E 17684 bytes
SHA-256: b384fcfdd8f3dbeb3132e70949c997924183cb2dc092b116d902f35c72eb5c62
font_01_sfnt_off00012feb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14802 10740 bytes
SHA-256: 5ca7ad75e9a597f064ac1055b451a4923236fa83f60900aa2d27b0b51fe07bba