Malicious PDF — malware analysis report

Static analysis result for SHA-256 3437b653a20918e4…

MALICIOUS

PDF

83.5 KB Created: 2021-08-12 21:34:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 71522fda419ceb71a9db673a3018f010 SHA-1: 1174f627228f67b79a5b5a2574cb4642b2f4831c SHA-256: 3437b653a20918e443293afc842cfd3d1964c9222099f6112aa9ea5acb0d5c73
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. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fbtniudmjitaq7mlj2k525dpl3/45825574071.pdf In PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/jorozikinavezexugul.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/18462091920.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/46937343643.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/68108822178.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/92622135824.pdfIn PDF document text
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/f8655da78bc2b5f6cca8d7a12459a4fb/64148418902.pdfIn PDF document text
    • http://slsnn.ru/content/files/xotononupevifewuwagamuja.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/9535732565.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/5bfea4900aceda15373416423a1423a1/wivopasilu.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1610944697821e---8190111466.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/4676212909.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609149fea4ef4---vabaletibelabemozosin.pdfIn PDF document text
    • https://pmms-online.com/assets/file/79227639138.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/61684597728.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/fe75421f23479a4b397b59918551608c/36282598521.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ec89ead3eb2d56bb117a2455ee73bed0/xobajerumebiwedazorefu.pdfIn PDF document text
    • http://mientrungland.net/uploads/image/files/fezimiw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1610c390db7de6---22200426039.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/8k7lcb81fegruc4fljbvhjj1d1/95172263224.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/46d39f872556e113398715e26423a68c/68851353635.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/acd5c81fce4e03773b154e3da9a8ee1c/88476508496.pdfIn PDF document text
    • http://e-hematologica.com/users//file/lipupolijolibajoko.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/rinuwuxetefe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=8.+s%C4%B1n%C4%B1f+veri+analizi+test+indirPDF 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_off0000e056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE056 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF86D 10576 bytes
SHA-256: da521b43b4e74e6297cde9518d48be463a4880587be244df6ad29d14c0fcfb98
font_02_sfnt_off000110a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A4 18360 bytes
SHA-256: 870f17047dca8136027e144425e8eea5669f729759f9d4bb489b7670f169b30c