Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad6e4afb877ba640…

MALICIOUS

PDF

82.0 KB Created: 2021-06-25 16:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f360c03bcc9e03611050fa0e5e874338 SHA-1: 2650b427b731ae167198fc511bb305506be1efae SHA-256: ad6e4afb877ba640f1c41229772c15ae9a9e64509496c5e93ef8b806df11f022
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Installation

This PDF document exhibits social engineering tactics, instructing the user to disable security software and execute commands, which is a common precursor to malware execution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs likely serve as download locations for secondary payloads, aligning with the ClickFix attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://archism.ru/uplcv?utm_term=resolving+dns+issues+windows+10 PDF link annotation
    • http://bettynblue.com/upload/fck_img/20210603/file/defuxokavixe.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/74ffe0bc398ec2bacbae388bd143eec6/60898140838.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/72101871768.pdfIn PDF document text
    • http://dalaichau.com/files/lomake.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/f624eaefaf30bcfe79cd2d8a8ad55e0b/81684980286.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16096668a10e0e---rigoxefiperinolax.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/0f7f0f4905f336387d14fa4cca10d567/ferevedevanuwevutoxovobup.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d7d598a2---90639179136.pdfIn PDF document text
    • http://bakoca.hu/files/file/livulikogelosilo.pdfIn PDF document text
    • https://stef-nancy.fr/upload/document/80703439280.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/sizaninoradaxuzozokupijur.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/pepekutarepi.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/20730331573.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/bf99fb79f7b5c413eebbd4983424bf5a/44261335014.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/6382880797.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_off0000dd7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f58f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58F 16840 bytes
SHA-256: 428bccf404e15ba387ee835265d58eb39259948d9817b96f0d1e4ce73d55977b
font_02_sfnt_off000121be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BE 10536 bytes
SHA-256: 65b769884b302d835bb63b4e272d6574ff1bae7870e24822d11643427528eb5d