Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bcb53568b440ed…

MALICIOUS

PDF

83.2 KB Created: 2021-09-08 01:57:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7d85fe7c61cad60e0b7dab92229a7e87 SHA-1: fb7678940e1ce7cd82dd038d47f1a41972b535cf SHA-256: b3bcb53568b440ed232a538b7cdb45239f5edd888d0ce4184cf4f68e512fcdaa
96 Risk Score

Malware Insights

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

The sample is a PDF document that contains numerous links to external PDFs hosted on compromised websites. The ML classifier strongly indicates maliciousness, and the presence of link farms on disposable hosting suggests an attempt to distribute further malicious content. No scripts were extracted, but the primary attack pattern involves directing users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/eb4d5592c2459f0d86d608cdf48326ef/53407620519.pdf In PDF document text
    • http://www.flamanville-76.fr/upload/file/8530892482.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0e067f2b2---bunebesafujaz.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609835918ad37---vemit.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96aedc8f15---62236444435.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/41fd95ae40b9e2ad159529fa877a63d6/penerozopapubikuxog.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824125e3332---36350042489.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/bevadokemofezitupejogir.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a8a362632cb13bc03765dd5fa4e6b0b/juzefapofaluxivemubimamon.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/811e39b11e9d2417c3925e7a1887ed00/70018884810.pdfIn PDF document text
    • http://edgecs.net/documents/73610611991.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/31062869659.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/welojufawozibuk.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a9a8da0d0---bulanuxedejifoleta.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d73828039---wizukujakekebivunuva.pdfIn PDF document text
    • http://designklasse.de/ckfinder/userfiles/files/radogu.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202107202252208006.pdfIn PDF document text
    • http://hollywoodterrace.org/clients/863344/File/boxofovalojerusudud.pdfIn PDF document text
    • http://usagimatur.com/files/others/nufukaxamezodipin.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/pekoxifidesitamusezol.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/0misbsd8scgl96o3b1ib3aj8p3/lebozaxovuz.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2c915033f---veteretofafota.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/togugofanidev.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/rubokiwonewajedadalunu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609889dc5815b---pimegedowixubidu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=zung+depression+inventory+pdfPDF 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_off0000e09e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09E 10708 bytes
SHA-256: 353b043b63aba4a0cedc19e1cad32b870d4592f79a2111773ecda0d0e7fb835a
font_01_sfnt_off0000f92a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92A 17672 bytes
SHA-256: 131916bd6709f7e9a746f7dacff063b560e7e1a997420362b36b411fcc7786ec
font_02_sfnt_off0001270f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1270F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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