Malicious PDF — malware analysis report

Static analysis result for SHA-256 b537372100c12bbf…

MALICIOUS

PDF

71.3 KB Created: 2021-09-28 07:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18f669ae0f6c8fc9f75db6488fadd99a SHA-1: f8594e24ee59bcd712e391f95c070e134c0e5c33 SHA-256: b537372100c12bbf6e5f9f4661efc2fb748c3f33c6a70335bf64c62674ef79ac
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan distribution vehicle. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=free+movies+online+sites+bollywood PDF link annotation
    • https://argentinaproduct.com/ckfinder/userfiles/files/rogaluter.pdfIn PDF document text
    • http://pretaporter-pegah.com/userfiles/file/vigimuk.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/mewesuzexafuduwapofafo.pdfIn PDF document text
    • https://digireg.li/upload/38002648344.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/45022467739.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/vejesenarupuwufekeder.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/58546156012.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/71808923188.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/pinajaxomesurumitu.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/vojaxum.pdfIn PDF document text
    • https://vaynhanh365.net/contents/files/41544345747.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/rususinejaburi.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138fdd37f443---84145289652.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613705ed1b1b8---kisusofekimozodu.pdfIn PDF document text
    • https://htchninc.com/d/files/dewedikolopeleju.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/76709652467.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/59775483266.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/q2eemkb5rb3i3ut0lt5jidotf7/watunidujosa.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/20219261959238764.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/xarovubedenomuzotese.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/jilokupogom.pdfIn PDF document text
    • http://yanartekstil.com/firma/files/jerekupepili.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/69960185657.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/fozuvabakizezevujur.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_off0000b2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB04 17056 bytes
SHA-256: 622d3c6c230e6b407829588db0d1243a78194c7eb0b5528d6593e9eecbe15290
font_02_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 10628 bytes
SHA-256: cab0e4f69175d90edfb6ca5a29e85e342b1943dfaf69464b0421c52258b8202f

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