Malicious PDF — malware analysis report

Static analysis result for SHA-256 e32877fa3be24be2…

MALICIOUS

PDF

86.5 KB Created: 2021-09-02 22:26:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f85be05c48281c68d65f6d8dadd34f48 SHA-1: 4855c7dc6ee1b70c3ba336c9b1e5ea0f8cb2b03e SHA-256: e32877fa3be24be2c53cccc5832b30a0a617af4b55688282199aae6649f7cd86
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' reinforces the attack pattern of directing users to potentially malicious external content. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://huntic.ru/uplcv?utm_term=airfoil+nomenclature+pdf PDF link annotation
    • http://www.asslar.de/downloads/pigunatolasexoba.pdfIn PDF document text
    • https://www.anandtirth.com/wp-content/plugins/super-forms/uploads/php/files/eo6m8h8p948oo5gec26029log3/fulefixap.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/lkari64caj25fr89n8gi6nrvhp/vafutajutedozanewaxinowux.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/63007243209.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6c929e308e2fb7d698ad1c8c8a0b6548/gozakafi.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4133fc054c---50787586561.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/9191288738.pdfIn PDF document text
    • http://classicalgardenstatues.com/uplds/file/70608758792.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/megaxuwegoluketejobipagu.pdfIn PDF document text
    • https://gospel-streams.com/asset/ckfinder/userfiles/files/nituronafowil.pdfIn PDF document text
    • https://actor-conseil.com/files/file/87897910316.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ea38c127d9---15244514146.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087654ee840f---2899741225.pdfIn PDF document text
    • https://rosycaffe.com/file/73115559175.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf4996c930a---35382039756.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/65980440365.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/zubas.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/27303670638.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b1d8fa488867568616cd38340a7c0c48/19718052171.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9ec5232b1---satepamuworulasasenab.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/nedepej.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/lozezezixugukudifevuselug.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/vimik.pdfIn PDF document text
    • http://banner-ever.com/ckImg/files/40124900579.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c182c94db17---pukatolino.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 10692 bytes
SHA-256: e6cf97b5888ff87054725243422ccf026e5bca1c4bbea28e0c30893479a547df
font_01_sfnt_off00010478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10478 18480 bytes
SHA-256: 6c1a85008a603c53eb4a4121343a693ffbef3118142765190f5e2f1fcdcb2d2a
font_02_sfnt_off000134cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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