Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc4f5060b050d89d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 02:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f343c1f11e3f67af4b5458d7a087753 SHA-1: 593857c6b74259a9a78ffecc00964daf352fd8c0 SHA-256: fc4f5060b050d89d6cd3e8b642f583699af8a74e87be4ed02a237044341d738d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://smidgel.ru/uplcv?utm_term=open+ended+questions+in+quantitative+research PDF link annotation
    • https://bloomland.com/sites/bloomland.com/files/kuvipevudanulozape.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/renulakewewerafugigukewiw.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/tozisixikap.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/koloraxusu.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/3a16f05f55c85889cb1a6006bb000048/goxar.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/faruxunivivitataki.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/fusagafov.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9cb692abc---poparupirejovaxixutileg.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160720acdcde22---zilizelikujafifupuwulitu.pdfIn PDF document text
    • https://harkakotony.hu/UserFiles/file/dorafa.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/b1beiujke729v5m8j1bc5f73n4/85547300941.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/kinujamitoveruvasopebuti.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210701043645.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210601161132.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/tegajuz.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/dedugegan.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b33b3643bb7---neteri.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/60026977123.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/fogekogipibu.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/jagomidejatiloxuvu.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/pogifojozifizedegumedo.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160952a00712c4---35474955884.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_off0000e0f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0F6 10904 bytes
SHA-256: 439853ac35d509f51020fed3cb0aafcf1e9db7a82fef6ed1b76a22f065394824
font_01_sfnt_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011211.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11211 17872 bytes
SHA-256: f98e2ee63a821f3d83fa76ffd5146489c1fefba31b78ce8f836ec51354f70a8d

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