Malicious PDF — malware analysis report

Static analysis result for SHA-256 ace7650a91b1e8e3…

MALICIOUS

PDF

92.3 KB Created: 2021-09-02 20:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6be9e3eb9e067e4a87795d0e7aae2f7a SHA-1: 3f5069f5dca311c64106835a4c903c3839c95d27 SHA-256: ace7650a91b1e8e3cc40295dac717e669b82902d2e199c81e460c5d9c66df621
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised WordPress sites, likely intended to host malicious content. The presence of PDF_RANDOM_URL_LINK and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a pattern of distributing malicious files via these compromised hosts. The ClamAV detection and ML classifier further support its malicious nature, suggesting it's a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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 https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160944a6ecb438---lusipekozidisuxokeruv.pdf In PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/mjag7730ei9idqjur36o1si0hq/rawikusabuxan.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16087df433014f---xefuzigibexatis.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/67202206764.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/473pbgbhrsb8safgs870c4d861/kirukomovadekis.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a41e697bd97---jejolozisodumeg.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af0e6451b6---97237578844.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/mamenufikebizujitobave.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2c93b2a7d---melodamare.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/pegarokugelarajuzat.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/74183019479.pdfIn PDF document text
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961873931fd---95590986042.pdfIn PDF document text
    • http://goldmustang.ru/files/files/13527048997.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/75911283716.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1627127962_1.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/fibizomaduzadi.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/38316801708.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/5223cb4457d949c3b08406b380b35f0e/wisisefo.pdfIn PDF document text
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/rovabavad.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/kuzisor.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/eae3518597ea6553c881eeea220dc2d9/sunemajitomeneveg.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607176bd0fa23---sonozisokekolivida.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a814c75c443---rimakijisewutokopijime.pdfIn PDF document text
    • http://malagi.pl/user-files/fck/file/tomiwogozizesululikofiw.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/74844814272.pdfIn PDF document text
    • http://denprokhorov.ru/images/file/77346762484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=maths+textbook+pdf+grade+10PDF 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_off0000fd29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD29 20800 bytes
SHA-256: c9c7575eb3e99ef20a01ac6d6d3e60f92954bf3acf456aa816fa2bc94082fa39
font_01_sfnt_off000131ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149C4 11036 bytes
SHA-256: 5a00b67f9cb32785af2e4b954f1e3f8415cb9fa6f701220e9695d5b300d65789

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