Malicious PDF — malware analysis report

Static analysis result for SHA-256 4782a302d8019539…

MALICIOUS

PDF

80.3 KB Created: 2021-09-07 20:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c5f99a373a5bbdffc31c269bdc64770d SHA-1: f0afc23d8cca1cf98045273bf2c486e7a510a1d0 SHA-256: 4782a302d80195395f4050eb177a7c36d576f62bc2c334fb3fa164aa4a911821
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to compromised WordPress upload directories, indicating a link farm designed to lure users to malicious sites. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification strongly supports its malicious nature. The primary function appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://cructi.ru/uplcv?utm_term=ielts+academic+reading+test+papers+with+answers+pdf PDF link annotation
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089c70e4e80d---81000326988.pdfIn PDF document text
    • http://dunajecbiala.pl/upload/File/93174027970.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/t0qead8bb0lpm8jan3elrjqofv/73151901732.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/21625722942.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/vugobawifa.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/mufezodovu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0f09c0eadf---2427737988.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/55094761535.pdfIn PDF document text
    • https://chp-travel.ir/data/file/43988994997.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/08d23b28ed27adebe8d699f16c6b0da5/7346286929.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/loliwuxokujozovozoz.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/valifokugol.pdfIn PDF document text
    • http://beiwendq.com/userfiles/file/98100500828.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/4335fff329efa2475fed14ba6450609d/viwusexineludunem.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/kukalafobenifopukizi.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/44639022750.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/99086052487.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcff90b4c21---pelasuri.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/59482581320.pdfIn PDF document text
    • http://pasaru.com/upload/files/28812873515.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/birager.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/laribosisasizoroxulevuwu.pdfIn PDF document text
    • http://phamtrangia.site/upload/files/bufev.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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 10984 bytes
SHA-256: 2bc6eacbfe9a491703200c96aebf9c27bbb0b98d26f56670d6acb6b24805a958
font_01_sfnt_off0000eca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA2 18368 bytes
SHA-256: 0eebc26b2bccd11044953f3539aab343d8e2f8908b6f2660ce646aec1f9bbd6a
font_02_sfnt_off00011b7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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