Malicious PDF — malware analysis report

Static analysis result for SHA-256 c526fe7cf6c9c3da…

MALICIOUS

PDF

78.4 KB Created: 2021-06-26 03:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e214f70982a8fdbc728d9776eff5cd2f SHA-1: 1496b5cb09fe0dc00a626ac19bcc764f4897d03c SHA-256: c526fe7cf6c9c3dabb6d443ea604315d22f52def905b462547e4bb6549527383
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. These URLs are part of a link farm strategy, likely intended to phish users or lead them to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607faa26630cb---bobasepepawuzogag.pdf
    • https://lee-trading.tw/archive/upload/files/wutimoluxun.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7caff5914332e692fb180e449aa97876/tukafopevarumazenowowama.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc5ca99be4---47588436582.pdf
    • http://aucoindeshalles.fr/menu/file/75603016312.pdf
    • http://www.cerathai.com/image/upload/File/90375220663.pdf
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16080b693ec5f5---xusujado.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/b76d92d635eb60d5fbf5765d56dc3181/labisutemapisuzasiwap.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/89744bef6d2a4d715d78029e6abb55a0/62837828103.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086cd21d3356---22426061257.pdf
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608a25aaca55b---4064862629.pdf
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/bovigaguk.pdf
    • http://cimkezes.hu/uploads/ckfinder/userfiles/files/nojuwikinitazegexovik.pdf
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/9b34faafdd41b9885a4987ae15794eb6/ronofowuduwadavifot.pdf
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608d451d7fcf6---latajerawoj.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872d06a5a89---96447928343.pdf
    • http://pampa.be/uploads/userfiles/files/viwusupidovimewejanajo.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbaa37d43e---lefosad.pdf
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210614080651.pdf
    • https://castilloexterior.org/ckfinder/userfiles/files/wododiwalufelufuwixogov.pdf
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/82041398688.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc884cbc42---jobulisisiweberezip.pdf
    • http://nakatka.com/files/file/90490878461.pdf
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/be0550820dc5c66f2997a0313c396097/19382813069.pdf
    • https://texigo.tw/upfile/files/2021/06/18/41918182527.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=silicon+valley+s1+torrent
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c94a.bin
c7df18cad8a9cd9937426f92ad7d9dfc133ad9e924260e357a27f5726b924816
pdf-font-stream PDF embedded font (sfnt) at offset 0xC94A 10532 bytes
font_01_sfnt_off0000e174.bin
b4f49056cc18071cbe4c15731a525b073c45565f6353187f2680dd1ed7088b55
pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 21180 bytes
font_02_sfnt_off000112e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112E0 16792 bytes