Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ef2500e7a98850…

MALICIOUS

PDF

82.4 KB Created: 2021-09-22 17:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a10cd133678f9ea70ec2c3d915bb799d SHA-1: 8e05bf10f5757abd1f4a9a02d62891fe7bf39e1e SHA-256: 49ef2500e7a988503e0e51e1a26021c3ad87df1ddab51e2b3b212242651e3b40
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm pointing to compromised CMS uploads and disposable hosting. The embedded URLs suggest an attempt to redirect users to potentially malicious sites, aligning with phishing or malware distribution tactics. Although no scripts were explicitly extracted, the PDF structure and heuristic firings indicate a malicious intent to leverage external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=project+cars+for+android PDF link annotation
    • http://metapolar.hu/tmp/67697745090.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/12258512958.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4urto5ooho36mjlp6cb97odk8v/10146232467.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/xivuwezajevefa.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091611212773499.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/63807276292.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/xozijiwaxix.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/68250691907.pdfIn PDF document text
    • http://madurastones.com/userfiles/file/wavikexiteponixelomuvuw.pdfIn PDF document text
    • https://www.jaegeraviation.com/ckfinder/userfiles/files/naxodoti.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/60185643686.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210901_CB35F0C905B529DC.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/72203882338.pdfIn PDF document text
    • http://qazaqbanki.kz/data/content/files/nobalakizerolekabopafeg.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/3658623537.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/zezurizidezewadodumuxuxiw.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/a8793b7d516ef4129b193101ede706f4/magevulodegupotow.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/nokiruxom.pdfIn PDF document text
    • https://rivieresoceanie.com/ckfinder/userfiles/files/jidalizoverarudaverasa.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161312335321f4---vajazeratesuxazikejajig.pdfIn PDF document text
    • http://fivelscope.net/fckimages/90170496917.pdfIn PDF document text
    • http://fuerst-architects.com/uploads/file/pikoregisinikimanudi.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/65405505628.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_off0000dca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 18136 bytes
SHA-256: 9e6b977d7638c30b5eca8b0537b6ac30a64afc4ff2f07a7f69862acf999debe2
font_01_sfnt_off00010bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DD 10552 bytes
SHA-256: 9b3f935c04821171aa29f35b58fab771a8405025cb16585209b43d39a2546fb6

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