Malicious PDF — malware analysis report

Static analysis result for SHA-256 eae1a3db0200adc4…

MALICIOUS

PDF

72.2 KB Created: 2021-09-01 12:07:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c0ac81a1834002cb3fa8a158d77504d6 SHA-1: 520e1c31733954aeb52337af8c817a0c144544ae SHA-256: eae1a3db0200adc4e3212979d268c95d761779e3a0589c68ab41150845740913
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detection and ML classification confirm its malicious nature, likely serving as a phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://oniceh.ru/uplcv?utm_term=loyal+and+steadfast PDF link annotation
    • http://lysfyyy.com/upload/files/zeziwojaduwazam.pdfIn PDF document text
    • http://mp-journal.com/media/file/disejojosox.pdfIn PDF document text
    • http://www.look4job.gr/images/_user_na/file/93053368645.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/34fqfcqkfis8n95e843d0rpk85/manubifisejani.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b6bf696fc7be82beb466dcdd54abd02f/88402227036.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/lajetudaniridefaxad.pdfIn PDF document text
    • http://watdoenwevandaag.nl/upload/54169244067.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/53773158703.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/fntkicc0vj88i31m85vubd0gj1/lusovikobisokazefuv.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/895a50535838ef0080720281827c1042/zavinomem.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160858a8a9b562---muxavifijowugavinefuwavi.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/rugotokulebow.pdfIn PDF document text
    • https://amd-export.com/site/upload/file/sorewujatonemokaz.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0c7eb0f2d---14772291820.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b8c9e20cf---12715461364.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1611c135e7ac25---tometogatuselajaxifofa.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/1mh0dhggmoli2s2ntcd5s34d9m/noteforakusuj.pdfIn PDF document text
    • http://sixtyguildersresearch.com/admin/photos/file/zesobufulivevez.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609be044a7434---60742444014.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec75d9357---ginijojudufixinozupotaxa.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/f4e28ce2bae793f9e4767a1b54016ecb/84526932857.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9f1a96322---wolunikosowatuzugaviwana.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_off0000b945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB945 15864 bytes
SHA-256: c72c9b15dfd23c07387b96a5711abfe3ea74ad43361766ae03f1002e8d104cde
font_01_sfnt_off0000e1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EA 10224 bytes
SHA-256: 854a06af64eeb9e5fbfecae7a1c2f212068daca4baedbfdac9e1add89414323d
font_02_sfnt_off0000f90b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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