Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa0cc7ee3d9f2e8…

MALICIOUS

PDF

80.7 KB Created: 2021-08-16 06:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 30e19cc684745ad2ff6491a420bbaf3e SHA-1: bca1881e5a13c03b0b1f9f37fdc7d868e6df4cc1 SHA-256: baa0cc7ee3d9f2e8f5b0b006776286c6a93ee1352d74d2915c836fbb8f3cd4aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to compromised WordPress sites, many of which host other PDF files. This suggests a link farm or redirection scheme designed to lead users to potentially malicious content. The ClamAV detection and ML classifier further support its malicious nature, indicating it is likely a phishing or trojan distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3aadc1fd0e---kisupipetonorewed.pdf In PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/4807ea334e936c7c8a80cd8f66a923f6/giworig.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082a8991266d---xekupuxejinejad.pdfIn PDF document text
    • http://gemculture.com/userfiles/file/sezerisufolude.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/riravudawudaw.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/37176384805.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/25627306324.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a846be61a78---fabajunowit.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/8ad37896ae19f89deaf1ac1cc82be0c4/4643543464.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/r8g387rd40kjn63r82li1fnmrc/pubewamegamibalaxazexisat.pdfIn PDF document text
    • https://onlinendttraining.net/files/43349132094.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/wavesatatuzobago.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/s0fvt67aqp6h74c1r5obk49om7/8495896615.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210619030441.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/0eef62e39688bf347681e2451aa98019/88080373474.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/65691948152.pdfIn PDF document text
    • https://hssanesteban.cl/files/gejomejuni.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/94100657220.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/ragulisesezaw.pdfIn PDF document text
    • http://zigzagontwerp.nl/sites/default/files/file/jitimar.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/160861a8e09e55---lusafogawubej.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/74026210674.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=animasi+juz+amma+-+metode+ummi+juz+30+anakPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c0b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B7 10952 bytes
SHA-256: 8958169ce203907b528bf8b5cc57c2cf5712899db63647395f8551b6256d21dd
font_01_sfnt_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF251 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 17128 bytes
SHA-256: ca29927d45a4b37516c15cd8bdb6b6140bef326428ca1388301388f7b5c46ee0

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