Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d54e840798939fd…

MALICIOUS

PDF

69.2 KB Created: 2021-09-26 19:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31334f1c539b5c73334fbc6ccfedd927 SHA-1: 19b044d804cde3e28455a28e8b2823b258c68659 SHA-256: 9d54e840798939fd2b438a0b3f9230e6693c5ef9f45e1b23c48fec71ab94ba42
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress upload directories or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to host further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://kamarkosong.com/contents/files/dimebino.pdf In PDF document text
    • http://dyccpharma.com/upload/files/2216677130.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/25920771818.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d86e4e085---65261149467.pdfIn PDF document text
    • http://slmj8.com/data/userfiles/files/32429905167.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109231552006287.pdfIn PDF document text
    • https://rubenoferro.com/userfiles/file/sekisusizavibodukola.pdfIn PDF document text
    • http://zsdbiopharm.com/upload/files/muzaseza.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139edf2254d8---rekadupij.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/51424027671.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/teweripozabapem.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/xizime.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468c07d5663---17744681342.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/42537711298.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/kapus.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/fofezudisinoju.pdfIn PDF document text
    • http://ginkgokatsudb.com/uploads/files/93034794701.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/70719138442.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/an11t18ek87c6m0mjv63ft4vo2/madusitagolu.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/xuzugexenelizamape.pdfIn PDF document text
    • http://keacg.com/upload/files/miwosekina.pdfIn PDF document text
    • https://shinaltd.ru/images/file/repajegawijekoxu.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/14757019075.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/161326d195e177---49695095571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=can+t+find+apps+on+androidPDF 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_off0000b1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D5 10344 bytes
SHA-256: 8ad749edc99551905602e6dc3960af6e82be4a4144b8f3eb861356149714854b
font_01_sfnt_off0000c949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC949 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 15044 bytes
SHA-256: d77d77e09daa36a51b579226c3ef16ab8cd1f1de364508432d6aa57f318fd0ee

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