Malicious PDF — malware analysis report

Static analysis result for SHA-256 74ea8feca306e8bf…

MALICIOUS

PDF

78.4 KB Created: 2021-08-18 06:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 728805e2d6bac5bb2e82d64ff6a1f044 SHA-1: d7009174ab0102899d76ebffaa004587f26d3d00 SHA-256: 74ea8feca306e8bfb86b24361ff0d6caba340e635c36fe735c7ab29fd6c25158
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Several heuristics indicate the PDF acts as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution lure. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • 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.
  • 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://rockhouseschool.com/rockhouse/uploads/files/baxegorabexudititiwa.pdf In PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610007681c7e5---lifoxewatag.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/6rdcq9vep9dmrlu7ia241a2hh3/46566938386.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16087b113cf7ea---toxodigokoz.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/81852984098.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160806cb90dd3f---xifiwarupok.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/kemevuboribavumituwogam.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/35015392859.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5891190bcb---gunuzodotosazusefegarubev.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075502ae86f3---90880354481.pdfIn PDF document text
    • https://ochronaskory.pl/pliki_user/File/gutodabodizimazev.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160987ab4a056e---61865579972.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/zifasinovadip.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160aed592458ed---japikaposivexuniji.pdfIn PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/xumolif.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/l22k6tec8bsneok1obkagsv25g/folanezulugadiw.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/libak.pdfIn PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/83691077351.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/69rq47sae52n0lo43oqcc47ua9/wipaponanemorasarinek.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea3b8d96a4---9940878228.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090eac1da60a---ruvupi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/e5037420464237eb67fbf22d41680dc3/29880540733.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079105666c8c---72174381819.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021070719431313.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/37347725261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=intensive+and+reflexive+pronoun+exercises+with+answersPDF 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_off0000cf59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF59 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76B 16176 bytes
SHA-256: d9a7489c45d32a685a602add2a7e7d4a18a3f1120b44fc5cdabf0926bd211efb
font_02_sfnt_off000110f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F8 11020 bytes
SHA-256: fddd998f71a674305d2485efbd286a0deb8ea7a4e533314643efcdbd6f81c25e