Malicious PDF — malware analysis report

Static analysis result for SHA-256 fffa1d5c57dbe0b9…

MALICIOUS

PDF

81.5 KB Created: 2021-09-02 09:54:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ee6cf4d852d43bda19c355957456512e SHA-1: fec941f6d9a4970f3ccfde96e27e3893d1c95294 SHA-256: fffa1d5c57dbe0b9a799d826447abbd1a5cbb616dcd45f5f6d871db858d90c62
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the presence of external URIs and the PDF structure itself are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://klassn.com/ckfinder/userfiles/files/2820357650.pdf In PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608577122a037---52778118147.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/47353664654.pdfIn PDF document text
    • http://gistfamilyreunion.com/clients/8/8c/8cbf0a40baaab9dd4734ff2cdbb1e120/File/melewubefezute.pdfIn PDF document text
    • http://markone-tools.com/upload/files/50247021019.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2d406762a1---mugejubebodijejed.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/54938972643.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/vixega.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/61986791668.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/nofegaboperafijo.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/88324805106.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/mikiwiwabenefapugama.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/riwuvox.pdfIn PDF document text
    • https://www.properties-thassos.com/wp-content/plugins/super-forms/uploads/php/files/tio5572vensdcjmfo4rfdh8mi8/61108026596.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/sjqqtt2naag2edoluhssl8d014/kurebes.pdfIn PDF document text
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/tuxebofepuxi.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ec8cb0c9c944e8d21db8924659385ede/lulesewopog.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/lurezakogobimoguvudazo.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/20408795435.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/61432600198.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/2t9klvfmrhr739a6c36vbu2v09/vozujetajudadi.pdfIn PDF document text
    • http://charontrade.hu/data/file/beraweviwenugajux.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/34530719295.pdfIn PDF document text
    • https://hitpoint.tw/userfiles/file/kodofokelotigosopibejak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=grillades+and+grits+emerilPDF 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_off0000d7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E5 18404 bytes
SHA-256: 79c547c7023bfe55e59b0158a7126051e488a0a9f57e943bf945744793699730
font_01_sfnt_off000107f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F9 10512 bytes
SHA-256: ccc910bc7c4797407b525a32e8623d71d53ea719ba191a5525834833c7f6e921
font_02_sfnt_off00011fa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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