Malicious PDF — malware analysis report

Static analysis result for SHA-256 39aea62984eb7382…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 11:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5b5aeb90a34dbf7c69043db2c4677b29 SHA-1: ac694b892881f6f5930a9761314bec5e739465ea SHA-256: 39aea62984eb7382db85f789f8f8ad7df976ed312e815201f46014e5f209a80b
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing software, a common social-engineering tactic. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised or disposable hosting, indicates the document likely serves as a dropper or phishing lure. The primary goal appears to be user deception to facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://diaochue.vn/userfiles/file/dozufowiporezu.pdf In PDF document text
    • http://fsf-vastroad.com/userfiles/file/nikogiroloxis.pdfIn PDF document text
    • http://samsung-service-center.ru/uploads/files/xuxosupiv.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/kfa7742qlo08i6lrgtncmc5877/7353282430.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/74415620249.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3543ccb379---zidabovadoxose.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/73ffc6qb8ueposm9e1l83bce65/zumudereboxubak.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/muxodase.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/samanimidefojerevij.pdfIn PDF document text
    • http://fletcherfamilyreunion.org/clients/52745/File/pevopeziburesavix.pdfIn PDF document text
    • http://vektorma.ru/uploads/assets/file/pebimiguxagux.pdfIn PDF document text
    • https://tenshinorchids.com/FCKeditor_upload/file/patubuxerizasux.pdfIn PDF document text
    • http://linkingpeople.info/userfiles/file/82876889000.pdfIn PDF document text
    • http://consoles-a-gagner.com/fckeditor/userfiles/file/wuniwoxeta.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086255b799d9---rufimobu.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/4827996549.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160822fe40bde9---64242592430.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cdc8114f22---29876203277.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/5gk0pi0uu4oqgp6scp31d1n8ln/67886013517.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/54536804358.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/ludagegojus.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/nulosavaxofodedotexiwina.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/475b5ef4c1956c59df2a636232593d10/94261675503.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f51fd77f43---98470545580.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/jjbb5a93ph727bt7ba9nueso4q/vuwiworoxumesuwozozojarum.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3446121f9---31432627608.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=lightweight+pdf+reader+for+windowsPDF 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_off0000dbc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC6 10772 bytes
SHA-256: f29a19038a4907726e5e5d55c2e2a7b4cdc5e9c9fc527149925c47fb91cee79a
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 18064 bytes
SHA-256: c76f96cff79afb7f59e9ae4af1f39a6763d0a18fb9f83ee49620a7b57544193e

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