Malicious PDF — malware analysis report

Static analysis result for SHA-256 079a169e6ff7a622…

MALICIOUS

PDF

68.3 KB Created: 2021-09-14 06:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d0bdbc36933e7c73770adb5ba1315ff9 SHA-1: df7812e9726b678068c533b905c276195e644855 SHA-256: 079a169e6ff7a622a7b467ee94cce418eb460743e0ab732e2d5d983c41f17645
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and numerous links to external URLs. Several heuristics indicate these links point to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The ClamAV detection and ML classifier further support its malicious nature. The embedded JavaScript likely facilitates the execution of malicious actions or redirects the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chcial.ru/uplcv?utm_term=olsh+randwick+church PDF link annotation
    • https://odontologosmalca.com/images/userfiles/file/15523553528.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/laxevowixiwumamarimorenoj.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161371f5046396---wutisatomebuxaperira.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/19459076080.pdfIn PDF document text
    • http://h04ydivan.ru/userfiles/file/sopulozage.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/17407247904.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/files/javefuma.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/65853161814.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/51451134884.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/vevivifokuron.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ac75c6a54---numarafoxuzunilaxuvulipi.pdfIn PDF document text
    • http://rigdrilling.org/userfiles/file/makikatidalikozawikome.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/fesunetumimeviguxukelam.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/suxurobanijifezawan.pdfIn PDF document text
    • http://csc0898.com/userfiles/file/20210905131503_tgtfso.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a8be8a1cc---jufewonawowiluzenugilez.pdfIn PDF document text
    • http://mcrlclient.gilcom.ro/ckfinder/userfiles/files/kidemujegekezew.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/7939746202.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/kijavatipegijemiguno.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/vejolirenim.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/xolazazejiniwasovof.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161359fc7e6cee---5013049381.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/68056215998.pdfIn PDF document text
    • 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_off0000b04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB04C 14540 bytes
SHA-256: 61e249170adfab7dab4910014d3bb2dd8f1fc4c23f99236af752fbb5fe9f1c18
font_01_sfnt_off0000d4bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ecd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD3 10420 bytes
SHA-256: 2a4098985c4d084c37288379b2d138f7806745bada1c6d1c2aceab54fe086cbb

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