Malicious PDF — malware analysis report

Static analysis result for SHA-256 11da7fb2f687d6f0…

MALICIOUS

PDF

89.6 KB Created: 2021-10-08 16:09:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bb6fb8275986a3fd4ac51e4cc27c1b5a SHA-1: c7cf167c56bb37c6747278c48560199819ffa2d7 SHA-256: 11da7fb2f687d6f032d529da23bf20677c72e0a8a1e8daf506189463e1227ee7
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 WordPress sites acting as a link farm. These links are designed to redirect users to other locations, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/534r38qj8g1hhab3l3mgql9ch8iragtv/55831616036.pdf In PDF document text
    • http://americasbestmanassas.com/uploads/files/73253254211.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/45775548892.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-10/file/81947542899.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/4a132ff9a806a71abba1f99cb1f9aa48/monolojizewarojibapisodip.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/9202669209.pdfIn PDF document text
    • https://greenboo.vn/uploads/files/92681055888.pdfIn PDF document text
    • https://felicityokolo.com/file/dapazexenepusiriporipam.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/8696830258.pdfIn PDF document text
    • http://kovofilm.cz/userfiles/file/603878199.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/5qkagn7rt4d14hh5of34js0d10/35963349212.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/9onqckgbr1i7lfra7892oeem1i/nugum.pdfIn PDF document text
    • https://pleasanton.com/wysiwygfiles/file/80806612594.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/tsagvmvf8qagl8mpjffouqb59j/75290724805.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614df6e9cd1c2---gikifuzutorikovilu.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/rebom.pdfIn PDF document text
    • http://pincesorvarshop.hu/editor_up/26742320979.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8a6016a07---53810271875.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614fda3bf0255---ginudivagexelonagebev.pdfIn PDF document text
    • https://cobaltinc.org/userfiles/file/14936615748.pdfIn PDF document text
    • http://falconltd.pl/cache/file/2866678235.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/jenogagujezakizidera.pdfIn PDF document text
    • http://goldenagegroup.vip/userfiles/file/26664538759.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/jokokotuvuvuwibo.pdfIn PDF document text
    • http://candemdientu.com/Images_upload/files/dokedojiwejetijefudib.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/jotuwodonadutaka.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614061b47b218---lozuzofe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+draw+a+rainforest+step+by+stepPDF 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_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 19580 bytes
SHA-256: d3ab597f5917d3e745a06329ae2c8801c67df567dd5e793f5c27c10bcb473f3f
font_01_sfnt_off000127e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14000 10776 bytes
SHA-256: e3ce80152d2029ee3b5cd688f997245b1f5009b5adfe0dca61b980716adaf5c2