Malicious PDF — malware analysis report

Static analysis result for SHA-256 804015b2a1ab7d11…

MALICIOUS

PDF

118.5 KB Created: 2021-06-28 03:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6228f4c244e29969cee1832237ac37ae SHA-1: 09fdeb93502eda9c121713c1ad7f68e4a1afbcd9 SHA-256: 804015b2a1ab7d11b6f4a9f7696c5e4b0fffc4cd9a96ab4013fa7c35639c7321
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic confirm the link farm behavior, likely serving as a lure to exploit clients.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9706

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://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/b81a4a950d2c673781bb35b82898046c/69075156126.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/poc5soq2aov9i6ts7rvuc98gs3/fisitibeneju.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86ea670bb---46204427256.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/12164468817.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8e8842ae072958e5a79544b1b9d20e69/pekup.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/9etjtki86519uinu0r2dq281j0/18908970830.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/bobaxorosa.pdfIn PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/g2fabsd2vjabf34rgd23k8l2ek/futogojopoxilup.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/mfh07piujruhljtt34tusa9006/ditozabawe.pdfIn PDF document text
    • http://synagoge-stommeln.de/ckfinder/userfiles/files/nuxufapokorikogiporovokit.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/06be20a9043201ef457cc17e4f069d63/82389529694.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/6217200907.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c1bf996d3c2---panefekizobafus.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/92261955844.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/451714865.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/97771589209.pdfIn PDF document text
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/1608b929b0b875---67987214142.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///bilalutezusun.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/1549005380.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d942b033c7---61297690757.pdfIn PDF document text
    • http://duhochmis.com/files/uploaded/files/30148381324.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/d613cc24cf5fe82a8e515f5fe27b0964/80210604136.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f495efb9c---wipexonewitabofopazukaxa.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c5427ebab---kewaw.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729b4e8ab01---gewume.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tojuvatem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=chemistry+vocabulary+definitionsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000155dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16DF3 11192 bytes
SHA-256: edbf7b0b15e6407045ca05dcc7dc971977daec7a0e1f22c45b424a728d721c20
font_02_sfnt_off00018804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18804 16168 bytes
SHA-256: 1cfb00680a8a18ef5d5af493cc5b57cfe410abeba37087ee2ecd799c98b61e68
font_03_sfnt_off00019d9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D9C 17816 bytes
SHA-256: 9c878658853d5f59eb362afa374e60402d69d0bb2dcd1bf062ed394048b53d4f

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