Malicious PDF — malware analysis report

Static analysis result for SHA-256 358ce07d0831b31c…

MALICIOUS

PDF

89.4 KB Created: 2021-06-30 05:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 5c22b9b9075e7dcb21281158297e4466 SHA-1: 1ca1369e0e81ebfc25c771c94ac28fb2205b0226 SHA-256: 358ce07d0831b31c777a2276f92d40a4d42ffdd0925cfe2f6303f00210703442
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous external URIs and points to compromised CMS upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://chcial.ru/uplcv?utm_term=multiple+heart+palpitations+a+day PDF link annotation
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/d0928809ff83817ea27908abc65422b5/32865834327.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078065913cb2---gapikopupamivivugufaferu.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202161035435265.pdfIn PDF document text
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607c14abd57c6---nilogipupedesavoras.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/dcdda9a7e3ee410e89d85084f5f833f2/54690047973.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607b91123334f---xojekesotiwutonotewin.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/jiwuzonitolu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5b9abe04c7---91282635980.pdfIn PDF document text
    • https://menu2uplus.com/images/file/34167631140.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/zavedesoxarebab.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/jajevakakudake.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92eea1319a---bupugekewojixuzuxapaduwos.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2abbd0280---53759429678.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/asuaoh69fv9koh02tq0bha8j87/wumiwulegavotidepugi.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/b51fd41b5774a128c6f0cc74a1941c6c/87169322432.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5998c74cc---girura.pdfIn PDF document text
    • http://phamtrangia.com/upload/files/73205569848.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/83002738344.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/438a4843f1f7ddd675530e872f7931ec/wexidilunu.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/vcfv95bchullq1ulegv50u2tli/49241137534.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160cc027a95e30---vigoxerirolovi.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/fotix.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/23dbd52b8953fce969650c1c9607214b/41248738350.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/wufodujamawuxusawidemup.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160c623f318d67---wokedotamaporanovewu.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57f28489c0---kekewoxunopusemuragagove.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/buwufirabenumas.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_off0000fbc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC5 16808 bytes
SHA-256: 04d773a9fca96aeaeecfbf9a253f1a4a1e39c4137ac4a1990220723d340b46a4
font_01_sfnt_off00012754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12754 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F6B 10696 bytes
SHA-256: 1522cdd859ff49a230be5aa12afd3005c3a70f2805f53d57397c8db184327f17

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