Malicious PDF — malware analysis report

Static analysis result for SHA-256 08521a0fb527d072…

MALICIOUS

PDF

111.7 KB Created: 2021-06-28 05:55:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c06b7e14683016858703d70f007964a3 SHA-1: 712ddcc0d3d778b2d43907a0f2807cacc1e14d4f SHA-256: 08521a0fb527d07219a42ccf976ae8390b6c49f28bcf631e09bebcdca062d666
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://heritagecambodiatravel.com/userfiles/file/vumijok.pdf In PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096568f52a0e---80695875941.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cac59e30363---80410374398.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/67500019540.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/tititesulemunuvi.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/d6gfjtnbsklvldd56jqo4qf057/vurofevoji.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608807f8c7a92---jolivanazas.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/81b0f41575fa59295aa4428634ca2ae3/viruwulegofexanifu.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-4-29/20210429120906868975.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/uhctj4qm6clvqrijmiitcb9pp2/77372917428.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5715bd120---zivew.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/lirodufolefesugizufok.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8b0e65b57---gajapabujuwuz.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/3b3d1023775438f9c4512ecd191e2a8a/70160950060.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/0eb4179c99e1bd1f0d7f4c0f75a63404/90114515713.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/kakepeloripirevevakekenek.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/hv9a41797dv3vfaqi6hmiehgq5/38583591180.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/pdsbsbua8lspo32t3n6fdp1jpj/11672894519.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/revebewatigetedi.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/bg5jlirc9bv58nvr6rlqk14pe0/29038294453.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc41a60bdf---vabaxujogofa.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/dabedifediteniwil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=speech+therapy+for+expressive+aphasiaPDF 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_off000150f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001690b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690B 18368 bytes
SHA-256: 3ad02b7e770493faa0be6aa9ac417a67a0c0377d2ab0cbd152cac2a0429d606c
font_02_sfnt_off00019894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19894 10784 bytes
SHA-256: 9928aaf6b1e7c366e5fff8388d97ec3ae909a0e18b02a6d43a413b2ca5bea7e0

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