Malicious PDF — malware analysis report

Static analysis result for SHA-256 0435278f5453c7c4…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 00:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e7766cc7ee0c086cc5a851c1a7bf4a67 SHA-1: 810b32b7a493f5ac726efb7de41441cb3425d995 SHA-256: 0435278f5453c7c4017adba2c7e8c7e7a99e2f770b72bf5d202ac8b1b7f3d7e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nhuaduongnhapkhauaz.org/upload/files/kalosomizejodajimul.pdf In PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/tezixonakarozazidiga.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/solupamor.pdfIn PDF document text
    • http://integrotech.pl/zdjecia/file/bukofoponewilapalel.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/6aed390a66c421eaf8ebbe52c8a52023/kuret.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/fadinoxaja.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/26248679679.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/wawetijelinufa.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/pudibajirigiv.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/47800542462.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/9121039547.pdfIn PDF document text
    • http://topp.pl/_topp/file/zigiwuvama.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/varebitaduvizapija.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161373a963e43b---69431205181.pdfIn PDF document text
    • https://riwg.in/userfiles/file/dakuzibedeleserivi.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/24764297679.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/83802507199.pdfIn PDF document text
    • http://retrolondontees.com/userfiles/file/94272375552.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b97bc93fd881b9501f127cafc38acdd5/fizewumimoxavosis.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/83904162007.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/88777fc18161fc01c678663b5947e3ed/razozisasudogom.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zedekanakuvazoje.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/wejojilajulofapinusuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=m51+update+3.0PDF 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_off0000c3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3D6 17264 bytes
SHA-256: de2683dc393a221ab82908abfeaf24a8cf45ee03cc3dec50b80bc7af60933f70
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 10396 bytes
SHA-256: 63dac5167f24f91bfd51933f6df1af029a7b981f754884da2a599f0db8eccb47
font_02_sfnt_off00010858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10858 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1