Malicious PDF — malware analysis report

Static analysis result for SHA-256 49eff83bdbed08fa…

MALICIOUS

PDF

81.6 KB Created: 2021-09-10 05:20:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6bd2a8e4383ad14a30797c5d831ea693 SHA-1: 5f9657e1daca14d395a4f8564c4842803200ab13 SHA-256: 49eff83bdbed08facc1db71d738ec841a79e880a39e28868ecee5847e5456cc8
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Heuristics identified multiple external URIs, including one pointing to a raw IP address and others hosted on compromised CMS upload directories and disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 http://dansungsala.com/uploads/files/89843450061.pdf In PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/c8d656f49cf3f8d4b256a7566f7995ad/dalavisanasawabi.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/wisugofasetuka.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/48989227123.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/25030567440.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/4556886937.pdfIn PDF document text
    • http://tamtamphat.com/upload/files/77345516991.pdfIn PDF document text
    • http://355353.ru/userfiles/file/salotenalu.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/071420562533.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/3961b548c1d387dbef0b2a2c45964bee/rokolerudolumeruwari.pdfIn PDF document text
    • https://amursvoidom.ru/media/files/medabopiwakivaj.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/tewuxilixuvodenegimoliz.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/42589378750.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/tinewosilosiwikonirowoduz.pdfIn PDF document text
    • https://saksisan.com/upload/ckfinder/files/31923528993.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/70dad19d62020ff16a2167c7742dad44/zitikugal.pdfIn PDF document text
    • http://greenld.com/userfiles/24358357462.pdfIn PDF document text
    • https://mavibusiness.it/file/20646074197.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/50583471376.pdfPDF link annotation
    • http://resurrection-life.net/userfiles/files/tidikomegugukiko.pdfIn PDF document text
    • https://maymac.info/userfiles/file/sewomuzimusisuribonaji.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613106844baf0---wumivuboninim.pdfIn PDF document text
    • http://ebus.cn/up_file/file/fevubugumodixubipete.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=calidad+y+productividad+humberto+gutierrez+pulido+4ta+edicion+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_off0000d0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E7 20672 bytes
SHA-256: ca9954bb2baba115f97515e1ef9fbc1bab79723ca277eb0f0e52358fbb45a0a3
font_01_sfnt_off00010593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DAA 11488 bytes
SHA-256: 1d2ec7b07b753ad43583bd7b49d8a0bee04879a7f9945e964f3754fcc7d987fc

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