Malicious PDF — malware analysis report

Static analysis result for SHA-256 73344bbc79cfd8d2…

MALICIOUS

PDF

84.2 KB Created: 2021-08-26 13:38:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: ccd46a97852b44fbb0130c4cd0182ea4 SHA-1: 4d4e29c85ca4c4f95afa70e5b75bf1d2b357a258 SHA-256: 73344bbc79cfd8d262f544684e73b286662651dffb926f8eb4e68e73f2f3d051
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://bkdesign.ee/userfiles/file/5980747610.pdf In PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/c6dae0bd7d18ec5e2fef1696ccfb0384/36121383220.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/63936787933.pdfIn PDF document text
    • http://chinazzjx.com/d/files/70978926427.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/c5n12g154n8eoec0olc686ki52/20354782385.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/rugujurigafal.pdfIn PDF document text
    • http://teormech.ru/teormech/usrimg/file/92881228326.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607589f131613---33344585349.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/tr2ooo5ikfs9343tm563h2m2dh/74265350121.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/412a9a3b46636b5447dba70dd2eac1b5/soxufapafamubasolofuwidez.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/l4bo6o18pkcobc2mge3r3ies69/77219549692.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/nasovuwas.pdfIn PDF document text
    • https://mingyi-lock.com/data/file/userfiles/files/nomuluzesofesuniv.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160badc8cb6e78---visediwimon.pdfIn PDF document text
    • http://geose.ru/userfiles/file/85991170874.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/43695783841.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d65593eda5---bofanuzumuluziwaru.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/055578e97fefa1ddfa94c2170e89844f/61086050745.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071f464707c0---fivobopuwunatusanadire.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/52sha5fc7kf3bqca2pg33p245s/69110052969.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/8fdd3a8127f2a00afc3de511f75a7de3/rinorujaduzag.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16082fdffa672d---letuzen.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9d010c07cc89a69c574f3381a62c7f91/26341694019.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16077968481a98---vazidogave.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/8834134865.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/kojejejulanibim.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/nivexonirezejif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2pac+top+songs+download+mp3PDF 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_off0000e4b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B2 17236 bytes
SHA-256: c9a04b430fc6b7f21123dfad6cb1c805381e36c0dd8346e0f49bcea7d4629c2c
font_01_sfnt_off0001112f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12946 10816 bytes
SHA-256: d349da55706450cf54945cc17631b054b66e42d89dc94a83db135a41e3940569

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