Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ba84655a080fc73…

MALICIOUS

PDF

78.1 KB Created: 2021-09-08 11:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bc9775828bfbeedb1cfedaed9e593c8d SHA-1: a8d34e361aa74afbb615c432edee988b12e027a1 SHA-256: 1ba84655a080fc7373c60c5d936e207122573e3d5382948b9febb11898659446
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS upload storage. This suggests the PDF is intended to lure users to malicious sites for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4597

Heuristics 5

  • 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
  • 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://smidgel.ru/uplcv?utm_term=fractions+and+percentages+worksheets+ks3
    • http://hoteldazegliotorino.com/userfiles/files/56482166452.pdf
    • http://kolasinprevoz.rs/slike/files/xifunefinupi.pdf
    • https://mides.vn/images/ckeditor/files/15631744823.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/c518be24c9b62574b216fa9de710169f/sixarufupoxozopam.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e90f494f1---20630850343.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745be6ced9---43924256175.pdf
    • http://cuuhoatudong.com/upload/files/97515212320.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ff6c19ffa529fd6d11e666902ab514d9/xilowawikajituvidavewukid.pdf
    • https://binarbaidservices.com/public_html/userfiles/file/86235727135.pdf
    • http://alfadent-volg.ru/images_uploads/files/nowozilinodisutag.pdf
    • https://gabconstruction.com/ckfinder/userfiles/files/kakinewu.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/tomunosegafepukifijefure.pdf
    • http://haitrungkim.vn/uploads/userfiles/file/zezogegepejilufiduwebavo.pdf
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/adbe561b05d55351b68130bc23b67f22/61326833103.pdf
    • https://all-new-wow.com/upload/files/55207339670.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/kkjpfi10pdue0eb1qmfhju6kmf/73412120767.pdf
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/7a677e0062499ca2962257a12eed15cb/liwus.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b085330bd93---gatagaxiledugaxerizole.pdf
    • https://www.douggoodkin.com/admin/ckfinder/userfiles/files/75113397515.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/rodogi.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd8dcc13d4e0b7fd37bdc74e4155566b/8324057779.pdf
    • http://seabeachthailand.com/UserFiles/file/62227898563.pdf
    • https://phunhai.net/upload/files/poreja.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/87524484516.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/ule60tf521of5gi4u84vld6rt6/tupozoneb.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b05035123d8---88494924352.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010938.bin
ee7195a4d6b68ff7a1b4841da8d94552419fc2e5a11c1b835ae8a4470225fd12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10938 19760 bytes

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