Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0055cbdc9716429…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 03:18:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 93faec6499c8b6815d64da678ee9d723 SHA-1: 68af5d9deb0033159e7dfa74af5d605b23152a98 SHA-256: c0055cbdc9716429017217fdd09eea9ccb8be940efaa6efb619944e2275203aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to lure users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://crysiq.ru/uplcv?utm_term=when+we+were+young+piano+music+pdf PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c8553bd2bb9---lagiroxigazufenegugefo.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/namogadoniwomuvigudinij.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/49228592927.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/xomuvivodusireg.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16073b7cca336d---50914903880.pdfIn PDF document text
    • http://cga82.com/admin/File/31321542420.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/79b30869e9209b099b52493cedc02e28/81363686477.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96a743cd1---3242370177.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ni4gvmlf4bf4pj54bhgkin1r62/fagebuluxatemugivegukon.pdfIn PDF document text
    • http://thaoduocvn.com/userfiles/image/file/kekufesozotaguzo.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12b6f074c61ae3176fcaa69ee572648e/fokulisume.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a1865e81a---gogajifele.pdfIn PDF document text
    • http://maxbrio.kr/files/files/gifamevinevukez.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/32068821198.pdfIn PDF document text
    • http://fittbike.hu/files/file/sadeludixawoxawum.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/8c6404d7f4e8385ef4dac2ea4661ed54/vupabenowufisorobawuradig.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e86cd83b06d---famuwuzimoxidogasup.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/wedunatuvino.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/bejumovitew.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/v244o71fn1q54m9fdrog4v0l70/tipij.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/19120341386.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c973ea82e---lenojesexixi.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6d1c5bcdae3a7e74430fdd2370482fc4/21178937812.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/bomasuzexamowazagebixomem.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_off0000e275.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE275 17612 bytes
SHA-256: 764933e92720e0fc670ba962c6eb191069e3f91f3d0acc83b9d7e430b9d645cd
font_01_sfnt_off00010fd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD9 11216 bytes
SHA-256: 94c054cf84f2bcd234642e0f7774055977031122e0c132074fe3af965d8f0b10
font_02_sfnt_off000129c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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