Malicious PDF — malware analysis report

Static analysis result for SHA-256 669b51573c5336e9…

MALICIOUS

PDF

75.1 KB Created: 2021-07-20 15:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d98135cbfce380c2574cdae207338bac SHA-1: f27f4df1b314274cce8a8944f3387bce74a306c3 SHA-256: 669b51573c5336e994633b728d4925140e793be759dd7b87d1330ffd6301a87b
164 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to external sites. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or malware delivery. The document body is unreadable, but the presence of multiple links to compromised CMS uploads and disposable hosting reinforces the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://apexibd.com/uploads/fck_uploads/file/54072340554.pdf In PDF document text
    • https://pinkrali.com/calisma2/files/uploads/makimixelejetikem.pdfIn PDF document text
    • http://ashioke.com/images/library/File/49538557331.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c5fd1f884---65834501491.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/pazom.pdfIn PDF document text
    • https://summit-christian-academy.com/scauserfiles/files/puxixifavimugizut.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/90hpat8pk47aqg4ucdq7uq6h23/sawazujalosefelozifiwir.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a15a1b5043d---kamosu.pdfIn PDF document text
    • https://subarini.ro/mm/file/perufokalab.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1623092229.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/49665898901.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ecbed92ebf077a3c6281935f90cfc1b4/30010499489.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfad0c3770---zuzeposerevi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1faf014643---53606890274.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/52540388041.pdfIn PDF document text
    • http://kammatrans.com/userfiles/files/vinulanujalu.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/54724998791.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/wiwenukuzuwegopor.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/d049ac6845b020b360a15a552672b40d/fesodabelixunom.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/kegot.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cc2ae64206b---denoro.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210608_221544.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/14757009307.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/fepajezuxebabilunuze.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad29bd66ccf---51178447085.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=agriculture+weeder+machine+project+report+pdfPDF 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_off0000c3c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3C0 11196 bytes
SHA-256: 7ab1536b5ade90084b53f5bcb18e6cf12883c264742ecbe8729cb1058f74543a
font_01_sfnt_off0000dd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD93 15788 bytes
SHA-256: ca8d8ad020977f78891748c06f542d107fb07094768a4b4617dd66abfb6d93bb
font_02_sfnt_off0001066e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1