Malicious PDF — malware analysis report

Static analysis result for SHA-256 162dfe220ba516a0…

MALICIOUS

PDF

82.3 KB Created: 2021-09-15 14:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2700e2f8be870e3fe07812636532f5a1 SHA-1: 1cd5c1b51f3c2f8833c6b732ac4828d3641e0f87 SHA-256: 162dfe220ba516a0acb1989df1a55dabce0f07a7bdf293df92a25b80e868f332
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tpijobportal.com/ckeditor/ckfinder/userfiles/files/72571422042.pdf In PDF document text
    • http://ouhkpthaa.org/userfiles/9807622082.pdfIn PDF document text
    • http://iknow.pl/files/file/53810482714.pdfIn PDF document text
    • http://amindoost.ir/images/upload/files/87893997072.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/bokidazimaxifosuru.pdfIn PDF document text
    • http://consade.com/userfiles/file/jikubutavogalurizajama.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/f57spuij68cbjap6ic93eqlufd/177061217.pdfIn PDF document text
    • http://fleshlight-tw.com/userfiles/file/30046921912.pdfIn PDF document text
    • http://truhlarstvisollner.cz/data/file/90083239325.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109151011119522.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/garatoz.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210905021025.pdfIn PDF document text
    • http://worldplastsolution.com/ckfinder/userfiles/files/96705977707.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/fogoberidabegabusafoguzut.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/78001493540.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/15833513646.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/21473576193.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/zusoleredokaxilefab.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe9404a79---20146205161.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/fojibetufoluvovagu.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/h7f9jus9mn4ek3gi9q0rr65sr5/dasaf.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/25066148496.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tl5cqfv9setc1ns2fvlbsvaklk/67915505877.pdfIn PDF document text
    • https://trainova.com/userfiles/file/84125436517.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/vodegutemugogiriju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=love+hope+and+magic+book+read+online+freePDF link annotation
    • 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_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 11056 bytes
SHA-256: 7f789bc41cdb6733a417324b45e0ec99ac96b3832a698a3d5950b007aaec8ccb
font_02_sfnt_off00010ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDD 17480 bytes
SHA-256: 55023980033e0570b48fed40d93f0d8e6c1f034068209ffe6fcd665bcbb82bf7