Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d592ac406800050…

MALICIOUS

PDF

73.6 KB Created: 2021-09-01 10:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf139af3ff422be0428b5d6bbfaf652b SHA-1: 7e0375cebd3ed4bccc6073c9abb3b7cb3f9b14e6 SHA-256: 5d592ac406800050da901bd3d05c7a5a67aaa8fb72834126d7002eec6e9e744e
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mbkpkgdjfcdrh57ql5mqp3flk7/135076371.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/2runopnuki5m0l868npeotc403/mefurekipiradoma.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/88949971844.pdfIn PDF document text
    • http://vipdiler.ru/files/file/3091834339.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/41699982982.pdfIn PDF document text
    • http://paulbwatkinslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21409571396.pdfIn PDF document text
    • https://gachbinhduong.com/upload/file/mireruzagerovegikidagozog.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/69740144702.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16090097820ee0---42721908229.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/18174738428.pdfIn PDF document text
    • http://zaiger.ru/img/file/33539665600.pdfIn PDF document text
    • http://bennyhigh73.com/clients/3/33/33ce00c6a031cf3b17a3dcf69aaa7594/File/77857145954.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/xegilutuzifokadej.pdfIn PDF document text
    • http://oasis-inwaste.asia/files/file/jojufiwaxezekogede.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/nutasim.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/a3e224ff1beb3a0e61c60f3c19cc3ddd/lidawerodugu.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021053003473873499.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051907173260.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608b15b718207---69659175611.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4f7adc9888---nujazinuzizezomumafukus.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/3qalnbron7jtfd37mu34ituqs4/neludobupuvaxusan.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/xipufofabajulalam.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2911ee3f44---59035108447.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/37883144117.pdfIn PDF document text
    • http://laetitiabernard.fr/images/file/resizafidozo.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074c500e096a---71213840882.pdfIn PDF document text
    • http://zjxfjc.com/uploadfiles/files/93670033520.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=small+white+bugs+on+plantsPDF 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_off0000c18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC18F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A1 15044 bytes
SHA-256: 769640b58b5ff204d6d6a2bd258c1a907d6932e43a3c6c44c3a3df2df68b8afe
font_02_sfnt_off0000fe4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4B 11000 bytes
SHA-256: 2246e1e18b07902ab08af7d84d3741b2238321b0f57d90d1399218253131f9c3

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