Malicious PDF — malware analysis report

Static analysis result for SHA-256 1317acb61fbe2bfc…

MALICIOUS

PDF

82.8 KB Created: 2021-09-06 18:52:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 407a0c9f30b8d07bdfcee4fa60412805 SHA-1: 72c81a0d778a6c18cc7089709825d09f4b583e1a SHA-256: 1317acb61fbe2bfcd9264f84ae9915bbed24b07562c662dcc96c02ce22200b1f
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 0.9974

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 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://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e7828d8ae6f---70600684528.pdf In PDF document text
    • http://automsystem.com/UploadFile/file/20210623143111480.pdfIn PDF document text
    • http://cabini.it/userfiles/files/bopix.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e012d8db9a4e2c2c75840486871894d9/mosaxoli.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/20750608279.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/fuzenuzukijano.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/43948725932.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/f149b573abfc45bf47aa0f5efdd5cf51/7376741675.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/47937882750.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/c5374c17f3184816da5f4bd9c0485954/36372110417.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/18052547371.pdfIn PDF document text
    • http://wakarusavalley.org/userfiles/file/33535608850.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609f898c8f8a1---labizuxab.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/60125013484.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/jawikasewukosodos.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/sowuvularam.pdfIn PDF document text
    • http://hanshintech.net/data/file/tipevidexugoxosetibubix.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b4714dc1f4---22065322772.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/78614811175.pdfIn PDF document text
    • http://inlygiaylynhua.com/upload/files/zesibitudik.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/4a9dbeae8e5eb58dd02006b6f7e8d584/turilozujowuwixulunataben.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/46476149663.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/jedh5mj9u999srsttbako3tgo7/80788022549.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607170c45bfd2---45078858269.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages//files/44776827731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=maharani+yesubai+book+pdf+free+downloadPDF 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_off0000da61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA61 11024 bytes
SHA-256: 0fc81458095b07c4409836c0287c3899bb5e6ce04964c7deea72e77dc6b7aaf5
font_01_sfnt_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 18856 bytes
SHA-256: 4864ddb5fecc41c5f7da6bc753497c63fa9c7691b03030c807234455bcaa9a5b
font_02_sfnt_off000124b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1