Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37e39e19e75a73c…

MALICIOUS

PDF

85.6 KB Created: 2021-08-25 13:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 56275bcb24c55ea4b95201ef8578d44a SHA-1: d8141eed86530c87f2de63dd92145508607e9f8a SHA-256: e37e39e19e75a73c21bc91db4ad53ef31f2403a9064b9b541d3e9e02f819d975
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of multiple compromised CMS upload links points to a coordinated effort to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac3fbbdf8---52916915781.pdf In PDF document text
    • http://ifaistos.reality.gr/~triantaf/images/file/71498997834.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608cb9039d6a8---4396742995.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e55d196f8f---3834440516.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d23798cd51---93198563057.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16076190e0476f---sevojuxokeriri.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607488123b0d7---304187769.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/vegugenedadomad.pdfIn PDF document text
    • http://chickenwild.com/upload/contents/images/images/29002357058.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/80336044475.pdfIn PDF document text
    • https://badrivishal.com/media/gidiziv.pdfIn PDF document text
    • https://fid-data.fr/app/webroot/uploaderfiles/81729358581.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/4a1d9a5b229e95a78f102acbfadf4802/xajasazulamoza.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/bonale.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4da49de00b---rofusetifoxo.pdfIn PDF document text
    • https://maturana.cl/upload/file/joragura.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/noforalidasal.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/59ccbe8c9ef2852f1087540a57e3d7fe/vizibijakilipik.pdfIn PDF document text
    • http://teresachild.com/upload/files/rapukiwevofawutavugozudi.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/ad9devg24h0qqlns7d8jkv1qor/79124822018.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/reson.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160827c7f45e9f---zavisipinefijudikomokavoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=incomplete+sentence+meaningPDF 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_off0000e9aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C1 10568 bytes
SHA-256: 4b52adc94ea32e0c668ae3466a71d1cc81a909c5afa19882d49ed7377e57873b
font_02_sfnt_off000119d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D4 17872 bytes
SHA-256: de0d8066b99c36757c3b719069f41a495b624417cb83bf752ece3bb10203869a

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