Malicious PDF — malware analysis report

Static analysis result for SHA-256 15ac8ee0b28dc2c6…

MALICIOUS

PDF

92.4 KB Created: 2021-08-11 13:21:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 8a61b0175c5090f59293c9ac165b5b2f SHA-1: 15163322fc80e2e0380a8e026604dd190fb3bd8b SHA-256: 15ac8ee0b28dc2c6c938a013502e25a3a2f43ce4c548adcfe2379793631e5e1a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a link farm pointing to compromised WordPress upload storage. The ML classifier and ClamAV also strongly indicated maliciousness. The presence of numerous URLs suggests a phishing or malware distribution attempt, likely leveraging the compromised sites to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://moveworldtogether.com/datas/files/28342626854.pdf In PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c075dec9fe---65294980167.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/25914321249.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eb0125cbb---99691827866.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5e7f06d313673c7eda8f2114d71e4c7c/xewerafisosimaxolunipo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768a6dc68f2---48718960663.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c437a96ab4a---99312238280.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/5c01e87d1bc2bc0a12c6602102f87216/3331796297.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/nuzol.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/fcb4ecde975cd9737ac898079cc3c96b/lixuzupujapivud.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/38aad053641b780662343bd9987213af/39275319040.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/monuxosawude.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5e5763d36---73720816816.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/74e396f6747e609e2440a4f57bbcb400/zepapenodoremok.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608672901220b---49347151077.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/vimuludepedored.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/72141855748.pdfIn PDF document text
    • https://jetaime-shop.com/files/59529214620.pdfIn PDF document text
    • http://kursadowicz.pl/Upload/file/katalesafoza.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7dad96f5c---39279728567.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210507142656.pdfIn PDF document text
    • http://wwstationery.com/files/file/22489243714.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16095d24e3e167---bivumadedelelobelixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=is+ssa+1099+sm+taxablePDF 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_off00010411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10411 10388 bytes
SHA-256: f3879691718f78f65a7ce1033c1da8143f1731b44f3c8f97e2000ea8ca45e397
font_01_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 18044 bytes
SHA-256: 2aa056ab7ff8abcceac1d52ff77caf07583f0944bcfffe5961ac047cd7fde94d
font_02_sfnt_off00014b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B19 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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