Malicious PDF — malware analysis report

Static analysis result for SHA-256 956ecc7be3366127…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 13:37:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ed8b492329e32bc8a90bf76c80bf40f SHA-1: f513bc8f59f8d8711dffa9f30bb1a4314b60598e SHA-256: 956ecc7be3366127465727d47d6dec761b0a87b1c306c3e1e1e37ac054fcb4ab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS upload storage and disposable hosting sites. The presence of multiple unknown reputation URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://harshahometutors.com/uniformkontakt/userfiles/image/files/32162663748.pdf In PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/51106848331.pdfIn PDF document text
    • https://x-software.cz/data/file/neraso.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613453869c582---fukafokanu.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/29100556623.pdfIn PDF document text
    • http://corse.annuaire-regional.com/ckfinder/userfiles/files/1593882465.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/rurunibunoxarijixe.pdfIn PDF document text
    • https://gotoko.com/cmsv2/upload/files/rubisu.pdfIn PDF document text
    • http://blackhorsesc.pl/userfiles/file/36228839581.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/69583899467.pdfIn PDF document text
    • http://geose.ru/userfiles/file/87942656388.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161352074c7293---mulonilosuzebuzikujeto.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/repabefo.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/velenamovudagebaxamilizes.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/wanuli.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/mixerugomidibizipozu.pdfIn PDF document text
    • https://fishboat.hr/files/32849157946.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/remdkp6sh5l4kvqbb3hhfspmpk/5734186835.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210904230648_1844872301.pdfIn PDF document text
    • http://hexindechem.com/upload/files/5605734134.pdfIn PDF document text
    • http://petraifevronii.ru/ckfinder/userfiles/files/vinudodujudefises.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/65194654238.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/fisabulenabimivirekigamaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=mahatma+gandhi+timeline+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_off0000b7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7D5 16304 bytes
SHA-256: 86d06d5f23095e9622d69525353679364149c8aa5e8b51042129b7b342456524
font_01_sfnt_off0000e1d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D6 10548 bytes
SHA-256: 9ee9b9d3365f5605c0ac3b36f1da4912ae507f414f1905d3b5857dff332896b2
font_02_sfnt_off0000f960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF960 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1