Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af39a9b9df9df72…

MALICIOUS

PDF

90.8 KB Created: 2021-07-29 10:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: c89a0bfc002628124af9db7c41af8c5a SHA-1: 7e19bb2b1f2794d70ee1c19f86048918b906b79a SHA-256: 8af39a9b9df9df7293a7c8947371fd90a0366d042dc50bf96201b99735e68005
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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 http://cy2hand.com/userfiles/37614352572.pdf In PDF document text
    • https://dineflon.com//files/barixajukuzaxiviwup.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/jogekovebukobe.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f9cb36642---tinururutuxamux.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/zamisegerovanavuvive.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a79d9e6f8---17214624446.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b198019dacd42b5dd6b0af866617cd81/85492270035.pdfIn PDF document text
    • http://reitinguok.lt/userfiles/file/fasokapetorefuwenup.pdfIn PDF document text
    • https://schlosshotel-murten.ch/userfiles/files/60056142584.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16075ea8b92db7---88698055797.pdfIn PDF document text
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/perg6lbrhhatis93dfhij8ps73/35182210416.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/fosafotegalupuputoju.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160877b527c3c9---90065390668.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/zonikizogubi.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/092b775310ffe4422f1718a4252a9471/fonaronivodidanetora.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/7554077404.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/6qujoq9k606fg60j9tancmdkck/wilabomupozixikomoluxevob.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/7333271029.pdfIn PDF document text
    • http://dfwsedan.com/nbloom/fckuploads/file/35251626594.pdfIn macro / runtime command snippet
    • http://drairtools.com/ckfinder/userfiles/files/pezuvabi.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/65493177959.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/c1b00966de7bfc5406e183cb69af1ebd/kexowodaluxidavadokikage.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/69315220667.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/6fecd893039957910b9487706cfa8c02/7202864423.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608927cd6a63d---saropilonefivefole.pdfIn PDF document text
    • http://bazis-expertizaIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+do+i+find+my+underwear+sizePDF link annotation
    • https://lapdonline.org/file/sabufiwabunamapebabomipa.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_off0000fe00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11617 10720 bytes
SHA-256: 6e2b14af00cae7cb1e064a0630f3dbf56d1bd8ef21f0dd8fb47297bef6179d01
font_02_sfnt_off00012ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EBB 17584 bytes
SHA-256: 2b42e31b58f152f8cda06491976b1d2574a80b04d70765382b82abdb3d579160

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