Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6ff0d43f2e0758…

MALICIOUS

PDF

77.6 KB Created: 2021-08-19 04:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3cd714ad6f5a26df9fcf06bdc71d5332 SHA-1: 96581152e45876514c70c72b80ef95e40846df34 SHA-256: 7c6ff0d43f2e0758c21ec05a38c6efebcea30a130d90836a5ccf7a510a4883cf
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, but the heuristic firings point to a pattern of using external URLs for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://tcsm62.org/uploads/news/file/9816138959.pdf In PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/ponowifenujakikorem.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/b5491d98da6b6ef8697c122e6cca9ede/besetilu.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/f4dc451ba7cf3c1b6993cae1653e0039/68409920460.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/ribajozegabimugovomafemet.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e500bd1f9---46711191165.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/binenebiputanemo.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/69264743107.pdfIn PDF document text
    • https://ubitanduk.com/contents//files/valirovewejixijesovudikid.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/fobalopisozu.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdab009ee6---mafuz.pdfIn PDF document text
    • https://jetaime-shop.com/files/1792576333.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/5dobimjni7bet2vtb9875579o0/noziwedewobajebex.pdfIn PDF document text
    • http://www.fan-consultants.com.tw/ezadmin/ckfinder/userfiles/files/6577318352.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a96993271---doxugasotegor.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/tewegijidapisofulalo.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/ef7bb6c3e90391639d536be9d0718602/zurukovin.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160edaaed8c34d---46067953628.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b759c2741db---98934645112.pdfIn PDF document text
    • http://ambulatorioveterinariobubiniregini.eu/userfiles/files/wixefuvujabo.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/tct397re06btse33kuh99ibs70/femutorobib.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9998cad214---lewamadibawufi.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/77527385972.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070532375a17---28172935171.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/gatosawesuvovi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=just+dance+greatest+hits+wii+romPDF 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_off0000c755.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC755 18008 bytes
SHA-256: 1f7680ec33df0c745ac64ff4a3ae17f2c063befdcbb39bcea73cb34151534f71
font_01_sfnt_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 10948 bytes
SHA-256: 662e42a7ecbdb95e8555447a544b89b2d5e934889dce8c4f21e4ce9bed460b2e
font_02_sfnt_off00010e6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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