Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e04984e758ed53…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 23:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e94198f5cdc2c523480381effce87a7 SHA-1: 5f238544af6abb916a8be690cf5e77688d2db4bb SHA-256: 41e04984e758ed53f8112d189c6c4fc06db1b5598b50e3bacb37f47d77d9d26e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer, likely to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://srtprogetti.eu/userfiles/files/vabupopa.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/22279240259.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8375d6348a3eafb1ae4998c57d224ff8/72150147067.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/tuvarewo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/jetinovodupi.pdfIn PDF document text
    • https://szallas-karpatalja.net/upload/77454713456.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139132b9b368---bipix.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/ludeteg.pdfIn PDF document text
    • http://air-ned.com/uploads/files/24969098675.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/457768976.pdfIn PDF document text
    • https://foursservices.com/nbloom/fckuploads/file/54292208291.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/68196670425.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/2e921eb0b2f8a9d644708071852178c6/27245396110.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/pimidijose.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/4518937427.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/liduguguwav.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/gesovutexanet.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/8558007484.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/56998469378.pdfIn PDF document text
    • https://tsegypt.com/file/makodowibusori.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/13882906907.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/28127371389.pdfIn PDF document text
    • http://teamtrinity.net/trinitya/file/jotexetusuxizawe.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/27246451598.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=gta+vice+city+ppsspp+game+downloadPDF 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_off0000c389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC389 11060 bytes
SHA-256: 37b7e81f9bf54a889e3df859031d793519f4897912a795bbbe0cd79aad77d168
font_01_sfnt_off0000dd3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54D 16792 bytes
SHA-256: 5eddaf5ccb869af2c5c56b5ac12456266700deda0ff3a1d68a32f36ed72a8584