Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a6eb8ded4da32d…

MALICIOUS

PDF

99.5 KB Created: 2021-08-04 20:10:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b6270b24a3be219ce57345b1e094145 SHA-1: 8c20db817f20174448d306da6896fbbfc3f400d9 SHA-256: 05a6eb8ded4da32d9be3bd474decab2b9a110962c19bb878d3b16c509e2cd27a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attack, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/1ba3fa1a40800df1018391999b014642/27062108405.pdf In PDF document text
    • http://sicilyontable.it/userfiles/files/12155938633.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/70336783820.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/h0ejisg70dcv0545lp1ufmbu11/3922637730.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/54149703616.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607950758cae1---15233666246.pdfIn PDF document text
    • http://liburnia.pl/userfiles/file/buvufukazidalopeg.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608994bd2a2d8---79074266523.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/80a01dd81938e7fc74ed6b1f203838a1/11284402210.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608716a79b802---2404334775.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/zefaselerafired.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3d8bf81d---83008822024.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ba3e969980dbac3ba93b7a68cabf8d44/20485527649.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/4de17db4acf9035093eecb1b99e8ab80/91525338421.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160850809043b8---nesunerarikudovidibaj.pdfIn PDF document text
    • http://grup-insaat.com/userfiles/file/nukigunoborixukoperid.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/5068422aef4dde3aee351bd41320adb5/10991483622.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ueb72i6v1f762rmkumvrm4er96/18799972538.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a81e5264ca1---likifonimiwevisatotuxize.pdfIn PDF document text
    • http://waelfawzy.com/userfiles/file/fanofaf.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/39732626020.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfbd6d5c79---jivowiw.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/47865843440.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/57jkmool1i5vj7fhvfgspt15rp/69228209151.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gkfl1sa54erckmfkqlrndt07g6/31753987993.pdfIn PDF document text
    • http://luvnchrlysenglishtoys.com/clients/861429/File/zodofogumunopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=reading+plus+answers+level+k+earthly+troublesPDF 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_off00011cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBB 18156 bytes
SHA-256: ef308220ac12b97f93313dfedd64c250e67ee26960d521f69d8049f17c3cb18f
font_01_sfnt_off00014c7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C7A 11316 bytes
SHA-256: 623bbccee8c6cb7034b3bf357378d593326362040f82d337c658b6a042b1a401
font_02_sfnt_off000166a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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