Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03a9f03e56df759…

MALICIOUS

PDF

91.9 KB Created: 2021-08-08 04:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 146956fac430e110c05de82418fc7b28 SHA-1: 66eb780af2969b2c3b7dd65c169e32fbde6aa9b6 SHA-256: a03a9f03e56df7596dd47ca0b4c04228f298aff0d3d74676f9e76007d168bd8a
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, so the primary attack vector appears to be the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://timeyear-v.com/userfiles/file/pupotubi.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/c8hnr4r2aisfiol1su1d6b3c25/bonikilidobanumifoberix.pdf
    • http://dragonspond.com/uploads/files/22067485838.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6f26e00c---wuzufapovaf.pdf
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904a2e4e346---jiruvopoxaru.pdf
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33017067130.pdf
    • http://decom.pro/admin/ckfinder/userfiles/files/nekobexitikazereribu.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/c5dc57b1f70bd6df59beb8af275be0fd/jevepitusaxawoxape.pdf
    • http://www.monts.sk/upload_images/file/pepadipaxed.pdf
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160723fd78aeb3---mavubozukepotadato.pdf
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/xugugoponexe.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/622126b5a4e6d4bb6295cdf9fe60f574/98860621777.pdf
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16084140629933---jefilepilutarovomiro.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc5a8fed9cd---noremalolesaseded.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/46996942250.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfe683a8fc---majemoluzisi.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/160816037a0827---82676727449.pdf
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160818292ac522---jimaxupapopevitufalizu.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/c5fc4fc62a7cd156ff048c5ff5d2889f/gaxirevufegesigu.pdf
    • http://adamshs-pdx.com/clients/d/d3/d3c120c733f7363e2cdaef2cff5f3687/File/84436238959.pdf
    • http://teleinwestor.com/userfiles/file/vatiwesobunobizakobiba.pdf
    • https://grnca.org/img/files/files/77878367888.pdf
    • http://jejuecotech.com/ckupload/files/zevavawi.pdf
    • http://abcbyspu.com/ckfinder/images_store/files/96376277543.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=train+conductor+world+optimal+map
    • 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_off00010302.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10302 16792 bytes
font_01_sfnt_off00011b14.bin
973f620242c9a981d81c430cc18aba877cba895128079435334e71327b653511
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B14 17360 bytes
font_02_sfnt_off000148a9.bin
21123d64e4e1221605f89c12a571d5dcef04df941554b64a9f7f470e352491d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x148A9 10524 bytes