Malicious PDF — malware analysis report

Static analysis result for SHA-256 278f56f20b4ddac7…

MALICIOUS

PDF

73.2 KB Created: 2021-09-08 08:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 247c3e704070a27ce718f5d2bb862ada SHA-1: c9dcc7d2043bf6036f6812134ae8bc1bfd596397 SHA-256: 278f56f20b4ddac75b0f89e59298a72ddb6ed41f78ba205030694e7d8b4daf63
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both flagged this PDF as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm with numerous URLs, many pointing to compromised WordPress uploads, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=onan+6500+generator+parts+manual PDF link annotation
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/ucis3uotakcu6bq01df8cr1in7/42983792325.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87a492dfb---54082777560.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/0k8kt0l2cajjv44cdnkblgurrf/54612053751.pdfIn PDF document text
    • http://tutek.eu/userfiles/file/14832662679.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/66535777165.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161181f3294d07---ponififulaxinoresasopife.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/48306378618.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/64931cf4817cf4af94388aa764cbdda5/logalopezararivibema.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/kidedigalesakurofepikajak.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9f8a34242---50211987551.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c89c5f289ec---70365370591.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/fupadukik.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kokaz.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a07a46adf38---64072086130.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/54086662998.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210802_202636.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/zosepejanixepaf.pdfIn PDF document text
    • http://pb-book.com/user_file/file/20040238120.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1084a76983---wulewij.pdfIn PDF document text
    • https://33mobility.net/uploads/files/53681149789.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/15851841321.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/60499362996.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/luraniriluwusetex.pdfIn PDF document text
    • 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_off0000ba9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA9B 16304 bytes
SHA-256: 09d76ce5db7af30eb5ea9d84c9ba75512e0308c3f4b8e91913220f47bef70660
font_01_sfnt_off0000e4be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD5 11052 bytes
SHA-256: 4296e1012c29b35aeca65ca2ece92bdbeb066cd310b08b900f9fbe8de5d97320

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