Malicious PDF — malware analysis report

Static analysis result for SHA-256 4552b2cf9a3193b3…

MALICIOUS

PDF

74.3 KB Created: 2021-06-19 16:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21470b12aa2d2f19750f7301cff410e5 SHA-1: a73d8d66d12318edf1eb6e2791c1b988c4c23d29 SHA-256: 4552b2cf9a3193b39c9e49d3f6a2d89e028366daf8cf9282eebb7438a8f8cae3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm pointing to various file hosting services, with a specific mention of 'gta 5 apk verification' in one URL, suggesting a lure for downloading applications. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs and link farm structure are indicative of a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://menuiserie-sainte-anne.fr/userfiles/file/togopamigedutuxugusebe.pdf
    • https://akapacha.com/userfiles/file/41405448383.pdf
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/24147632130.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/21acf1627164ea7c8c0bbeacda971a39/11191851487.pdf
    • https://fertilizergranulatorprice.com/d/files/besasonufok.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/09a1a1ddf4061b6aab927c116c057787/muxilu.pdf
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6h8mdltqf8ltr1l38e5rr5l1rh/26008574628.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607fddf392b07---vokajen.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f233fc727a---9154657821.pdf
    • http://ahsaipu.com/v15/Upload/file/2021513151305747.pdf
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/0a28990a04bc18226f58985ab09ed194/40586208935.pdf
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608f603bb4e65---20928686306.pdf
    • http://goldnumber.info/userfiles/file/38195336935.pdf
    • http://abwcoliseum.com/uploads/files/wixesamigevimojinato.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/rolukawikejiragofejifekif.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1e853dc0f---madurazamefirutu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=gta+5+apk+verification
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6c0.bin
486a20d4fd3548302ecbeff5c8881b52292f0129017fc76da696a76f3ca58daf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 5080 bytes
font_01_sfnt_off0000f835.bin
b0e01dd282461661e16b2576d9f9be04b488894e088c35be962e970030ffcede		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 10588 bytes

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