Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e9dc2c13014794…

MALICIOUS

PDF

87.5 KB Created: 2021-06-25 23:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2d6653b6d4af4b1fffb4acce2fc98e8 SHA-1: 22c2cff6107145ae374faa0145f689941c33f104 SHA-256: c3e9dc2c13014794f11bf9d9059e66db05315c77b9c2c0734d3d5f0942743476
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The primary attack pattern involves luring users through a malicious attachment to a network of potentially harmful links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://villatoscana-pi.it/userfiles/file/53828164256.pdf
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a30b91714bd---26833770379.pdf
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/5756f43b77a536779546441c52285a69/pixomiludixuwobizazesonij.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p379i20r678s7atjl2a26dmul4/towafowijevegalapulonisok.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/jesatq10vs1jcgs8gcmuvljdpr/rukezujixolorumidatus.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e32294a971---39191400377.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16097d1a3a425b---sawujorumafolib.pdf
    • http://brmxn.com/userfiles/file/20210516120146_u3o8uu.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/sg7eh8r7ss1khvquadhevoa66c/daduxuxireja.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcd481d12---11280729939.pdf
    • https://abe-rdc.com/userfiles/file/11699150201.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ltsc7sjrq4q6n4q8gmdpd01occ/vaveluwopexenigofafibegaf.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd7e457548---devale.pdf
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a9cb7fb65---15610916637.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160929d2fac96d---15687531988.pdf
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078eddf57592---sesagavobajiraxatisamegos.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e22cca0e6c809c0eaa3f96c35c009651/16963064455.pdf
    • http://thebeautyofdesign.nl/ckfinder/userfiles/files/forunudekud.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/c5697c3f315077d44eb37260603f2550/38944544934.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/af5e8d80vt8b53iib0f2tcstv4/67417493733.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609251df01bc7---kevijoxumorezixal.pdf
    • http://jonkmp.nl/img/cms/file/gagexunit.pdf
    • http://tyextractor.com/d/files/71467698898.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160b3c86a24585---49134741482.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cold+trouble+breathing
    • 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_off0000f399.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 16792 bytes
font_01_sfnt_off00010bb0.bin
2ca26d7ed4996a85cea80385dd09512ef27a420fa692334f19974546298d42fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 10632 bytes
font_02_sfnt_off000123ab.bin
3c86934050897485ae6019863815f8e85c44c4d570195fab0f919dafda5ceff2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 17372 bytes

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