Malicious PDF — malware analysis report

Static analysis result for SHA-256 58b422a5a56304a6…

MALICIOUS

PDF

102.8 KB Created: 2021-06-30 06:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 45f5d96bb754e4aadd16eccaec1ae012 SHA-1: 137a144f7f0723387cc0bbe95df2645b6be1a038 SHA-256: 58b422a5a56304a6f262dde1ccef4583596951927ddffec3fe7a8c65c6ba1544
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 WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body is unreadable, but the heuristic firings and URL analysis confirm the malicious nature of the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/gihe2s8vmku5inulv30kgarplu/vobadinugavobe.pdf In PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17044481306.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bedf65bedc---janoxilevifa.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/21621626f002d1ae2ebbb57dcdd28400/wetonimejikeke.pdfIn PDF document text
    • http://ypperfect.com/ckfinder/userfiles/files/31060644750.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af9419d51be---77236867724.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/64685000649.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ce1be898e---befilojezofigekoxob.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/16093ea1d19507---7078725102.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/ruwixifivab.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/21f1ad5bca9ffcae72f8622fd54f62de/50664162640.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a40012bfb---39654516234.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/o9d5cu9cnh37uu9pfv6tl1plvp/vogikadad.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/lonejamaladozu.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/12400305742.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xitosonukebodezase.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dv2sfs5drup1ndcucd6233sudb/zobozaxipex.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/5588925823c05d5a887b771b8ee51d05/19027921786.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c89503e16---pilenorarepinatodide.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e605fcd2b4---fapinupajolerepi.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/51ed2ddc2571fe39d0c5af6a5714e5b5/20935427860.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/juvarijubowufa.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1609a73f99cabb---tupolalebon.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/difubovobuvig.pdfIn PDF document text
    • http://yilip.net/userData/board/file/ziluxiririzav.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcc539e833---39093331489.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=but+you+know+happiness+can+be+foundPDF 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_off00012f8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F8B 11156 bytes
SHA-256: 3506243c30e8db1aaa1ba981d2e29554ba68b9956ffedd3e34c3dc3b84687011
font_01_sfnt_off00014989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14989 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001619b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1619B 16856 bytes
SHA-256: e9b9fe0b524a84ba8f9a07afddf52afd9e0b3b6a28514d8f2760499e635e2cff