Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ee28d2c4e7c23a…

MALICIOUS

PDF

78.7 KB Created: 2021-09-06 04:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4295497818dd1fb7b3e39f682ff3b716 SHA-1: 7ba5f675d4aa783665e9864a366b905e42b56374 SHA-256: c1ee28d2c4e7c23a7f7699afd50c0cc44de1b9e8c0e1f67245ad2e54a6ca22e0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and link farms indicates an attempt to lead users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://allytemp.ru/uplcv?utm_term=algebraic+expressions+and+identities+class+8+pdf PDF link annotation
    • http://z500.si/files/59138239433.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c73ccb8bb5c---nuzejoratubotafexobobizen.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/53130269780.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/ed6gvjf74cske3mcsnencslhi1/fipes.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/47a1122433d9180d06d16441f12eeb02/41695645928.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/banikawigalorekanik.pdfIn PDF document text
    • http://zoo-foto.cz/userfiles/file/54333068828.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7252cda023---11933357374.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/bujepog.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/32461037444.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/gli5sud1jcvfdnmq9k1c7ih4av/37974315176.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a6c2393d6---96424817096.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/xofiva.pdfIn PDF document text
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/dcf54479d15b5a6ae33c661f9cb08fd9/23296141203.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/81873165176.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/irezajazibixarit.pdfIn PDF document text
    • http://prmakeup.com/Image/files/dirugifokamopofukufife.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/39273638047.pdfIn PDF document text
    • https://panama4d.com/contents//files/jomanidojetelomotude.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/bexekakovagufekawosafu.pdfIn PDF document text
    • http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/wolapogolopobajoworemid.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/9845273456.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/xalela.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/taxinav.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_off0000ca43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE255 18732 bytes
SHA-256: 3ace279c158eaa8df0c0d0c9ea7de204e6600563c6a0c4aed5f172ceb94591a7
font_02_sfnt_off00011284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11284 11228 bytes
SHA-256: 43925f08a3464b4f14741539ac7f185c001fc8d9955d2a6bad83097fb78aa37e

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