Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4d9be1ad7c32b94…

MALICIOUS

PDF

97.6 KB Created: 2021-08-13 18:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: c0bfe40a328c75b42f551b9da8274f00 SHA-1: bd9e304c2d27dfb3a2e4faf861a8aa90f1d3a51d SHA-256: a4d9be1ad7c32b94fd2ff5355e933243e4da0f8e623ad9656d0c7cad37357ed6
164 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites. The presence of numerous external URIs, including links to compromised CMS uploads and disposable hosting, strongly suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rafaelokazakov.com/file/getivebirini.pdf In PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/cc005606993e46e927391c0d4e37ce78/26477340109.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d8dcfedc0ae---mizazovatijubirijepu.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/97180077110.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/61255071618.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/6oc738qrd7bkpaj80iu7cmoo5q/40311203719.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/voxexuru.pdfIn PDF document text
    • http://physiotherapy-warwickshire.com/user_file/file/5932984240.pdfIn PDF document text
    • http://abwmountvernon.com/uploads/files/55677830465.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0a5220bc5---pupisunakikajodakurel.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/jivijolilijakubojuzutupuz.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/jefamixisoporomulaxesiwo.pdfIn PDF document text
    • http://vvk-wiedermann.at/userfiles/file/rosafeximoxiwalib.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ff92db462bc6435e439c79e47a166682/50248112344.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///59235093464.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ad4c69694---torofizajadakapijomuta.pdfIn PDF document text
    • https://www.nickelmarket.co.za/includes/ckfinder/userfiles/files/72801611625.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/fe639ad1face7df6a3e9a7c3617e66b1/luloputokenaluxinekifefob.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4da74ae27f---86091271193.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i8pvj7ck1v5tq03v95q7n22qp0/19483490984.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/30135385827.pdfIn PDF document text
    • https://schilderlesvakantie.nl/ckfinder/userfiles/files/luzuvot.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/13534645174.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/58ba9a67753a0e9671a5bdbe67656b33/28766242421.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/58fdcafb4ff0ddf4fe0bdc49b8ac9668/36777916391.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cpm+chapter+5+homework+answersPDF 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_off000115ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115BA 18916 bytes
SHA-256: 8970e344bd7dea1cb168315bffc1d4d965209e379d4bcc143d374b41fe2c6ce7
font_01_sfnt_off000147d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147D1 10844 bytes
SHA-256: 966879f9578b5e74b0c0dd85df80b64a44b7f9e17fbf0e967ab461abf068cfb3
font_02_sfnt_off000160dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1