Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e047afde443726…

MALICIOUS

PDF

125.1 KB Created: 2021-07-31 15:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0d8fc6331ee8f75c3a3d0d1d673c9dc6 SHA-1: 52899e00a94f9f1940b3b5c0bdaf5bf186bdc86d SHA-256: 52e047afde443726aaa391cb94284ad439c02a39fe085780687b2731697f1548
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised WordPress sites, suggesting a phishing or link-farming scheme. The PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://wastran.ru/uplcv?utm_term=criminal+justice+a+brief+introduction+12th+edition+chapter+4 PDF link annotation
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/7eff898223f8f0f2a54a2740c34a1a9c/kawifakiditetavi.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a55b11c0aeb---dikosatugizozegumajedil.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0rqs7dijpemlmfh4h7tirakttd/66894306393.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/dfurtl9lnhudgqiq4qbhdotfl0/xekukazogovalexemexuvumo.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdaadb8efd---40104264551.pdfIn PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/posifeporutokeleri.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946469ea641---59778601303.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/15477427122.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160835f4ff2ad7---23748242492.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f83cca10077---tupasiros.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d78c14e5f809577fc4963b1be74dab01/94710505793.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e498fe8852a---govinipi.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/sagilorujisawunexuxix.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/ria33lbuv2662i356pb1e0khj1/tuzatetama.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/tepuxitineveponago.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089b63b644f5---kaxikoludiponodexikaka.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/6d1cb24979040feeb24cb2ad1e065d6f/39457055210.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/9611874599.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d98658e641---92895564313.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/76632218832.pdfIn PDF document text
    • http://ccl-ciecie.pl/userfiles/file/manake.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/a3697a9dbbcd647d3c0a70ee1531611c/velirakav.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001851a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1851A 11536 bytes
SHA-256: b81e9e5f1838b972f7fe8447372dadf9a187df3eeb71bd1656fa7031722504f4
font_01_sfnt_off0001a01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A01F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B831 17116 bytes
SHA-256: ee38bb5799f447c76eb68d30708dd700adf659bd897a2eef089bafa21c35ba49

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