Malicious PDF — malware analysis report

Static analysis result for SHA-256 309892d9144be547…

MALICIOUS

PDF

71.8 KB Created: 2021-09-24 22:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ee0846bd43ba6bceaf846f191bd7bb79 SHA-1: 7404af2a048274210d7d03375bf4630461a34f53 SHA-256: 309892d9144be547ae7005fc6238200cc2108adf124452b0ed37b19539b77001
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites, suggesting a phishing or malware distribution scheme. The embedded URLs and the nature of the heuristics strongly indicate an attempt to lure users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=best+top+video+editing+app+for+android PDF link annotation
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16135388b611d0---73216705876.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c9631a3e809f01f29549c9809156320b/webupoxexasowalijodeviz.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/makerixazawugi.pdfIn PDF document text
    • https://bela.geekers.tw/upload/file_folder/file/rujonod.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/1aceb038d2aed0b5c7880be619b554fe/zawito.pdfIn PDF document text
    • http://inbjnews.com/data/cheditor/0603/files/1299745069.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/jobom.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/55780349189.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/60797305912.pdfIn PDF document text
    • https://eltdb.com/UserFiles/files/98838067965.pdfIn PDF document text
    • http://samocvet.org/foto/ck/files/fakojitud.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/72989699615.pdfIn PDF document text
    • https://lorus.rs/files/59908004496.pdfIn PDF document text
    • http://omegapizza.net/uploads/files/lanagalixavevakip.pdfIn PDF document text
    • http://cavusofis.com/images_upload/files/81922725229.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/84426466670.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/66556307162.pdfIn PDF document text
    • http://julianina.dk/upload/file/28604522281.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/58412264206.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/gagilupusovemedaruxovimi.pdfIn PDF document text
    • http://gpe-el.pro/ckfinder/userfiles/files/gobixijuzotesewo.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/sirinewutuno.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/7056076924.pdfIn PDF document text
    • https://suruburi.net/mm/file/43725310096.pdfIn PDF document text
    • http://myappartement.de/web/editor/files/39688001481.pdfIn PDF document text
    • http://tion.hu/upload/file/tadoxete.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_off0000b4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD8 17220 bytes
SHA-256: 204665e041cb66f142e63fe5db6f0c70a83ece0155e50ab399921e0f7308c8fe
font_02_sfnt_off0000f8ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8EA 10748 bytes
SHA-256: 1cd7adffc0269ade805c9201f23b04b51c5923b8a9215bad067ddb9882650588

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