Malicious PDF — malware analysis report

Static analysis result for SHA-256 500989d381341cc6…

MALICIOUS

PDF

77.7 KB Created: 2021-09-17 21:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 56a2b428985d1767406a2f3dc4fbd679 SHA-1: 056143a7519e8068ada91266834eb47962706793 SHA-256: 500989d381341cc6550debcf0372b42a38a8a93f9f3517059133a9a4025d93e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, including one pointing to a compromised WordPress upload storage, and others on disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and heuristic firings indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://xn--h1acbpobggs.xn--p1ai/data/files/vuzifawobozabotuf.pdf In PDF document text
    • http://spharma.ua/files/file/penuluwikonatutome.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/lawizotosumifusife.pdfIn PDF document text
    • http://fireprovietnam.net/luutru/files/vadovawerisoladirativo.pdfIn PDF document text
    • http://ilonew.tasksplan.com/ckfinder/userfiles/files/maguwalulodawabefabiruk.pdfIn PDF document text
    • https://derfo.info/resimler/files/miduvemimugavova.pdfIn PDF document text
    • http://w-mill.jp/images/file/26389423824.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/ninoju.pdfIn PDF document text
    • http://www.moyekolodin.com/files/bolinezotigunuxom.pdfIn PDF document text
    • https://cananalimdar.com/wp-content/plugins/super-forms/uploads/php/files/j4gti1ad5el2lhkqoq94gk0m3l/zawokukefesenitejadu.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/24266736122.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc90ea896d---54758166095.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/80583a91617c283946e921f5c0ad3402/filalaxitukulizufuxados.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/xoxenawe.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/xapiwesaze.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/mapuzuk.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/nesixufude.pdfIn PDF document text
    • http://www.naraihillgolf.com/admin/userfiles/file/97703741902.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/51677586881.pdfIn PDF document text
    • http://jingmingtai.com/filespath/files/20210908152123.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/8987623656.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/bexitikuratalozafoluzo.pdfIn PDF document text
    • http://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/pularovilabujarudugi.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/51707088207.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=police+car+car+games+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_off0000cdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDB5 10704 bytes
SHA-256: ee92572fad3458c463c24dc33755205ce019970d586b57abb7d3a3997134a1d7
font_01_sfnt_off0000e60f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60F 16828 bytes
SHA-256: 4b4a0ab7c7e30f406942ad5362461663e0c4e64f4177d24139a880464c127923
font_02_sfnt_off00011169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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