Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b88c92f4416a82…

MALICIOUS

PDF

73.3 KB Created: 2021-07-01 16:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13483d72ffb1b90a74e34f1d209f38c3 SHA-1: a9e8355b7401b41004327846a64b14ce690583ae SHA-256: c0b88c92f4416a828e4f2429c82c8ed6e1de2bc5764c33147c79debe85a660b6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with malware distribution or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9893

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://tandartsindex.nl/images/uploads/lodivituzepuzinesavonop.pdf
    • http://deborahkay.com/ckfinder/userfiles/files/zenigawozi.pdf
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd87d3a57d---fosuwepezugoragewarat.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cb066c85a65---julewo.pdf
    • https://weilaimachinery.com/userfiles/files/jubalafubamozuje.pdf
    • http://skomi.ru/img/files/file/59525756676.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/2urbmlg2t1fmrhfrc3j4rblok3/lufeludopojat.pdf
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/d3b27c0db0c41c511fe05f58690d1b2c/24210216903.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071352ef0e33---jujaso.pdf
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/p1nif31fu6h5j7a0vbtck51us3/12703788460.pdf
    • http://whatdwellswithin.com/file/mozewevagegegu.pdf
    • http://mgocsm.in/userfiles/file/97744511988.pdf
    • http://stlnsk.ru/uploads/file/gepuwobalirip.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eda7b5123f---gunufilitimi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4d8df52b4b---7514781348.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf2190fd28---95932201739.pdf
    • http://51-lq.com/userfiles/file///tuferinomatogijivowopifi.pdf
    • https://advantagelic.com/singhania/downloads/file/pogibijaxeletasomum.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b902f90948---22111321725.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca0dc52f82---watulakiwiwodoniniwo.pdf
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8df31a35c---94857794430.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/02169a3506d4333cf04afb3c7c579d02/nupezudenozaselil.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/ggdvu5lkpeb870ihvs6svg5g73/nojogik.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a56a93f1b84---kezewip.pdf
    • http://jrmhandling.nl/upload/file/gutorebojagopoxodopugiri.pdf
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62be418715---94064610172.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=lotus+river+old+age+home
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bdaa.bin
9d021ad47825fc68de1b26064ac4cef06cb08f0ed21a46734a89fcbcbb9a689b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBDAA 16124 bytes
font_01_sfnt_off0000e771.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE771 16792 bytes
font_02_sfnt_off0000ff88.bin
007b93316cc546ce74ae2807470cb5d77f9a7c1431186d96cf326d51b8923e2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF88 10712 bytes

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