Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa4a57a094aade9e…

MALICIOUS

PDF

73.0 KB Created: 2021-08-31 00:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 199e0a98a7d60d75be65a3c1c76fae93 SHA-1: 574fda459c1015515fc9749af62b0eac155f3c3b SHA-256: fa4a57a094aade9e1480dbaf7e100c426507be447192a44854aa9212a00193a1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous external links suggest a link farm designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fd6ae9c1df---nitirulubizut.pdf In PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/f3c3fe62405e96748a0568fe4b57402f/53662044276.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/38032468017.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c205118cfa9---ruropovexoginomezelawufob.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/nezapojasutavanozojizema.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/27758295217.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210808_4EB59295F8855F40.pdfIn PDF document text
    • http://pronobile.de/catalog/file/39301559944.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bae2b5d5d---67093120680.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/l2p2fp3oqd029ouna8ne8oipb4/18334913040.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/jmmoaoaf3md3hoh3pcga5hh1e5/19227429654.pdfIn PDF document text
    • http://realloans.com/clients/73966/File/48175597114.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vbj6v2karpjlnu6k8mdqffl617/55516662679.pdfIn PDF document text
    • https://lazerom.pro/media/file/15919309233.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/55729149739.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/48447613299.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/306858a7f631d427327d746286556d57/9577146443.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-8-16/20210816082925612042.pdfIn PDF document text
    • http://roxburyhs1987.com/clients/63080/File/kekidafonedofojubipe.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/85157227468.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/topivesedaxeva.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/32087085613.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/30835840849.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed7e68cd56---vamilenipimaberodafatedax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=valency+of+carbon+in+ethanePDF 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_off0000bedd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEDD 10488 bytes
SHA-256: 1798bb63c13bff4b6abb9f6069409fa8c7b0bb59793819d097a79be778e7c4d5
font_01_sfnt_off0000d6a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A7 15300 bytes
SHA-256: 900aff1e1bb8132243dbe1840f7c5064aaadfb2b9df7f5d759458927b6be7b33
font_02_sfnt_off0000fd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1