Malicious PDF — malware analysis report

Static analysis result for SHA-256 2850af8cda1ab0ed…

MALICIOUS

PDF

81.2 KB Created: 2021-07-21 04:05:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 08a3d097d7ab73b9450c6d76fac951d4 SHA-1: dd7874dfdb9a8800301fb99a57a8289a8432848b SHA-256: 2850af8cda1ab0eda6ea43a6c04fdbc3bc402ede1f78372cd65a0596fe2b9b32
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. Heuristics indicate it functions as a link farm, pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd6412d93a---xoruguwatexaba.pdf In PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/5e575d5a50618cff8790d18446e75d1a/gakipoxafi.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/gujaxot.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jixukizisiwusafozip.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/31996958803.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/10aaa4313e96abb2e84f6b9746e1b0b5/pupibeveguvubunimodewu.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/945a8ccf43eb2567fba28a5c986145c5/22941941315.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/7073905042.pdfIn PDF document text
    • http://chixue.com/uploadfile/file/20210612145212.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/91011708328.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/t5rijojdi4anldnmsb19ck3npj/87638791447.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/wozalimoxizax.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/80383525575.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f3cfe142a1---26483078116.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/tasagojekamatubadi.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607772e930f91---lafala.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/bijabisewimakip.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/mqrd7h765iqg83frpdjvgd8man/90392979196.pdfIn PDF document text
    • https://hotel-la-licorne.fr/userfiles/file/fisawatekedizep.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/05b9266331bbfe647b33d820ca93bc2d/riwug.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/lr49anh3re90kd4c12hacc2mdd/wijejupukosiluramoxok.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/melomituwe.pdfIn PDF document text
    • http://myshopgroup.com/userfiles/files/20933801352.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ac4ca7868---20986024763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=video+star+ios+android+apkPDF 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 10400 bytes
SHA-256: 8ee3b829cc17455a91498dcf163ec19a5a02628e44315a4a6117c9a700b7a959
font_01_sfnt_off0000f46c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C7E 16832 bytes
SHA-256: 501e0f15831318d2d1881d78cd167fb1edabbcbff3c57aa7469b72f32dcd4858

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