Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca5fcd8a688ca7ef…

MALICIOUS

PDF

145.7 KB Created: 2021-07-19 23:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 17c6c0d8350ef4e7514c82ebbda3939c SHA-1: 4691c63d99d0c90ce581dfd917cd30d47f213ee8 SHA-256: ca5fcd8a688ca7efb05b61e71c200a13ca497461585a74150baec3fc94019fc5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other domains, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the heuristic firings strongly indicate the file's purpose is to lure users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086f49ec5e52---69462060230.pdf In PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/24489085616.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9e8b30f0141524bd9ed3ec878ad20ca9/86269374979.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607262ff792ca---39401080665.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dafd860a155---melovole.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/uh2g66u9scigig35t11aep79ie/75245781154.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/lemagitida.pdfIn PDF document text
    • http://anpo.vn/upload/files/92725551485.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/8sioovd9tet1c2lqq9l8m21b9o/39484314574.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/23532687934.pdfIn PDF document text
    • http://xn--80aafkqcanfpgnhbng3b5i9a.xn--p1ai/pict/file/51306058323.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210622201551.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607963a951330---sozupil.pdfIn PDF document text
    • http://schmetterlingsgaerten.de/file/89294478400.pdfIn PDF document text
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16091554556029---jarobena.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0605/e76ffe5d9e9d6109f0cdce6aefd3f040.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/87574781121.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/vimupulitupopojirod.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///nepajulifawuwe.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/vaxawulerijok.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/32838163760.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=non+ob+transvaginal+ultrasoundPDF 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_off0001db2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB2F 10576 bytes
SHA-256: 05443a4bee09b6e3839e054dd87b9cf795a1f24d90c7a087dd0839b743726419
font_01_sfnt_off0001f339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F339 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00020b4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B4B 17772 bytes
SHA-256: 312ddf5fe609a316396c5e2b66d681f8d2b1d8b867e6d5200f0fad05b48327e0

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