Malicious PDF — malware analysis report

Static analysis result for SHA-256 097b82a513542e4e…

MALICIOUS

PDF

79.6 KB Created: 2021-09-10 06:53:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fc8316d5da7e1cc15b8ba29df55a1d0e SHA-1: 9084a38c883caf6c6303cf8f2258d9925d41b2ec SHA-256: 097b82a513542e4e1a986e70ec3bf8347f867b424d156ffd52f9e2e02105c6d2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, including links to compromised WordPress uploads and disposable hosting, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier further support its malicious nature, likely as a downloader or redirector for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://synerhu.ru/uplcv?utm_term=cleo+mod+apk PDF link annotation
    • http://sxnqx.org/upload/file/Fl202109021055062227.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/rusasaperazi.pdfIn PDF document text
    • http://12shio5.com/contents/files/sedet.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/tubexinovekuxigikilatu.pdfIn PDF document text
    • http://tiramisu-o.com/yamituki-n/uploads/files/85088601106.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a995834a79---61969455802.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/355022246.pdfIn PDF document text
    • https://triosms.com/userfiles/file/kiziwetiwuwupowemodumu.pdfIn PDF document text
    • http://voyagevietnamlaos.com/hinhanh/file/kafowapanaj.pdfIn PDF document text
    • http://rotarycochinharbour.org/ci/userfiles/files/49442636748.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132945daf4d6---14983765459.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/niwajagevavakewela.pdfPDF link annotation
    • https://anitt.in/ckfinder/userfiles/files/88265268900.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/leleto.pdfIn PDF document text
    • https://www.sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/94571981899.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/14401006313.pdfIn PDF document text
    • http://hrt-foto.hu/_user/file/miwuragex.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/5995053116.pdfIn PDF document text
    • http://airmon.hu/images/files/kebixubotomaxaw.pdfIn PDF document text
    • https://indirimlipin.com/calisma2/files/uploads/81133757447.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/161360450119b3---88114035582.pdfIn PDF document text
    • http://sakra.sk/storage/file/juwirudabazunetolixuga.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_off0000d597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAE 10112 bytes
SHA-256: e4db0584b4b8fe48e4cdc1e1fbc5156f9c82edbc76a96762836bbfc3f078c018
font_02_sfnt_off00010443.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10443 17272 bytes
SHA-256: 1e5b1d89daf209d18e84f0e9b7c50bf3a1fbf34299f28dbb136b83f02de107d9

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