Malicious PDF — malware analysis report

Static analysis result for SHA-256 d45e77f5e863766f…

MALICIOUS

PDF

95.8 KB Created: 2021-08-01 19:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d6d277de9c5e5afee82a0afb523d84a4 SHA-1: 64cb3ffda256dd0d3735ee89a3ce4cab9dd559f8 SHA-256: d45e77f5e863766f45c39fffa817faea9c184d1067cbe5372d7c22bbe1ae81d2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. 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 0.9726

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 http://cafemsoffice.com/userfiles/files/61752724770.pdf In PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db1d7dab92b---xovepeligomu.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16083e91699ca9---4028639465.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/427ab67a68b076912ba08d715aed9853/14865241498.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/petukugasosiboxifuz.pdfIn PDF document text
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/9lpggs187dbv2l2t5iq4h0an5h/mivigolelivet.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/48900c7a62024e9f26371542046beecc/18951769585.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/nesikuwol.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/67770619518.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/29423817953.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1279dfac1.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/65054819739.pdfIn PDF document text
    • http://studiosantese.eu/userfiles/files/40537425924.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/28289415917.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b88ba51043---nuxumevobepunuxobija.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/nawazeburerelog.pdfIn PDF document text
    • https://wonkingchina.com/d/files/jikilezifepiguvimesebi.pdfIn PDF document text
    • http://highlandcougars83.com/clients/2/26/268573c5102cd00412bac87cee9346ec/File/gitofatitem.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa783f6f0cb---47655678493.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/871cbd1933feadcbf7f3b38f24b72af0/4280603949.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a82cc703f3b---lazinujozeva.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/jatezemorotew.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/e515a68ae26805b2ede9ba2de3edfd19/lumadoriw.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/kikojikujutitebopik.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/ab9956756279129d6cf051268faf555f/ridaberopum.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/11621302823.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=frequency+distribution+table+and+histogram+worksheetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000facc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 17224 bytes
SHA-256: add08a4bdde6cef52ccb0710d5d00d7c082472705b1bdb78254c283ea53e97b4
font_02_sfnt_off00014005.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14005 16280 bytes
SHA-256: 783ddab299fa29e3048f0ddab1f2595187cb2b039748a8caae8566b34fcab416
font_03_sfnt_off000155f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155F3 11472 bytes
SHA-256: 7bc7045a0139ec30a316ed209e65b833eba93cf6f0e76958a5f3c14816fed315

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