Malicious PDF — malware analysis report

Static analysis result for SHA-256 88c0822ab05d3a46…

MALICIOUS

PDF

82.6 KB Created: 2021-09-18 14:46:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0884076c9d3770facbff3f72f7076ab5 SHA-1: df4717bba52b92c8642f704a08011ec96dcd99ec SHA-256: 88c0822ab05d3a461c23f427da1293c206a8c3340660544958c8dfea7142ed2e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a link farm designed to lead users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/e3c94b7e560a2364e73742a3a4a33557/71346443147.pdf In PDF document text
    • http://techscreening.com/userfiles/files/29607863231.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/83739792789.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/baweburoditifen.pdfIn PDF document text
    • http://www.saveurspoitoucharentes.com/admin/ckfinder/userfiles/files/safumezedivasimalajubus.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614577491cbfe---mavezu.pdfIn PDF document text
    • https://fultoys.com/userfiles/32603680380.pdfIn PDF document text
    • http://rc-modeller.se/images/file///55913116057.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/33664716334.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/3b71a0cc5c22f37f939e048f89d0c51a/97565152029.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/kesesapop.pdfIn PDF document text
    • https://martas.vodrsport.cz/uploads/files/10353334514.pdfIn PDF document text
    • http://debten.net/UserFiles/File/wasepodadewizovujosuzej.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/wazalikomijisotosojum.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/99025a16d3a99293e4f70bd77cfe7905/fuvonekasebafajaxokiliva.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/58f7af1e40676adcf74a177866b5f809/vasoxosadunoxisogomuzopo.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/zokawuk.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109012111259767.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/xidova.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/70644221556.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/20009550591.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/jelep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+pocket+edition+texturesPDF 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_off0000da68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA68 10856 bytes
SHA-256: 40ceedc26bab08d8a15681cc506327202fef5e8bad7c5a62d15e65daab534de4
font_01_sfnt_off0000f3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A4 18760 bytes
SHA-256: d5e3ae906667337ceb5c8a826f0c298bc6686d41d784fd29f88e25bda3af6bfa
font_02_sfnt_off00012538.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12538 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1