Malicious PDF — malware analysis report

Static analysis result for SHA-256 81aa2bbb8da0d486…

MALICIOUS

PDF

83.4 KB Created: 2021-07-09 04:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: aa14db043bc82e84db8203afaaa9490f SHA-1: e4649810d95382a5ce204d8c1377db9042bf8f58 SHA-256: 81aa2bbb8da0d486ede2db2e347c5c114f4424ce3287670dc5211c5bab7812e6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16077e1d532938---6356286920.pdf In PDF document text
    • https://hansenlight.com/UploadFile/files/47854571405.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718976abf4f---dinaxoxajikuzozet.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/18102649984.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7fc83faa3---saxuvidokexusewufexifuved.pdfIn PDF document text
    • http://biolabsrl.org/userfiles/files/36293183231.pdfIn PDF document text
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/7d22774d34ed23b112186c168c7e3063/63295315392.pdfIn PDF document text
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/b2a4d890211f404f20cfa953aedc858f/zimumedaxegusozi.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/jugafozedel.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/27e48d7e140597f5fa5f2ece1e9cec42/womemuxujesamufa.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aa075c06dd8---xutulinejipojaxiz.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/59255030434.pdfIn PDF document text
    • http://kimkhimientrung.com/uploads/image/files/navivikuk.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/rotavulubos.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/pipowizonol.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606ebc7eba89f---samabugi.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/86083888103.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/xixatejitadiziti.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/vc20tgel4n0vo3g8l5p705sttt/vesupudomas.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/80813109590.pdfIn PDF document text
    • http://51www.org/uploadfile/file/2c46d873e9a092c2744138f748308213.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16077c7bc55fbd---bozijomawulek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=action+words+worksheets+for+grade+2PDF 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_off0000caad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 16924 bytes
SHA-256: faab0b9b0556ca2261410c74bc916fbb74ec871c4034f59f746d1f7c2a8cdc7e
font_02_sfnt_off00010e88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E88 16784 bytes
SHA-256: f0c788f0ab8ab9e0a136d5dec5d044a3d2764d306176d37adc56d4debe18cb59
font_03_sfnt_off00012652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12652 10988 bytes
SHA-256: 9bdac5c92d4da7d57114a03ee532a7e4e09dd994b38d441cd81e35d731d54d18

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