Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77a52904e74e124…

MALICIOUS

PDF

91.5 KB Created: 2021-08-01 01:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20c3de29b5093df6a40fb5de8a478ebd SHA-1: 1f14c57e025342c5e5442ada6076718535f97ec5 SHA-256: b77a52904e74e1242cd1edf68174da974ea6f93a0426b28d5468176738e80fb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous compromised websites, a common tactic for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The document's structure and embedded URLs suggest it is designed to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fb4054f456---44371827876.pdf In PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210704020041.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608382cfe9a5a---bupawobomul.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/f4351daaeca88b9af80529f07c38638e/30482116797.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/d3d94ngvbs1i43n5nash62ldrq/jenigupixojo.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/izaraxosirokediwekesa.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a79bea4d7---wipizafuzokarevitije.pdfIn PDF document text
    • https://iguanapools.com.au/wp-content/plugins/super-forms/uploads/php/files/2cdvvq9uopvssj16kuihtnu2e8/sesixaluxaninozomunore.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/7l8g5u61lbvs5ni9b58oi59ljj/31716163949.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/62829503328.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/52pvr3ej7jt72qrkqg7op14qa8/7067166933.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b079aad7e---28396392175.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160890a406680c---59881559387.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/penazoleduvagi.pdfIn PDF document text
    • http://centrons.com/uploaded/file/37770611660b48ab77a9b6.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/a39ft4gsvtkorldemh39k6ehrv/vagixesuxizutamowex.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e878871869e---27963892291.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/96966765742.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa15bb8d8b6---nugebijado.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/1bbb1bd89b598080903088259dc46ab3/befijozijisezumu.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbae7f33fa---56123516831.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/vixadikudex.pdfIn PDF document text
    • https://minegociomiweb.com/userfiles/file/pukapoxug.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/polelujujanagovidate.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c3855debecb---38824974463.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/kivatugagojukolifaneb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=el+dorado+county+police+blotterPDF 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://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_off00010328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10328 10676 bytes
SHA-256: de42c6e821d4b8f2e1e998754b9509c934d2a348df2b93b308916e79bd1b894f
font_01_sfnt_off00011b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B71 18136 bytes
SHA-256: 915d58e12b827a75e59d0bc2dd8fede5972076be82dcd6b8a08cc84fc2db4084
font_02_sfnt_off000149f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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