Malicious PDF — malware analysis report

Static analysis result for SHA-256 937473d4428afbff…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 21:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 91c6bea620680215aa56c0f3c8c04b92 SHA-1: 57e65355c0cab950c2b17245d028a7d91e03d2ab SHA-256: 937473d4428afbff53d48e73e80896baa144413718cb5bfd972a5bf45468b0b9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm with numerous URLs, some pointing to compromised WordPress uploads and disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing lures designed to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wagaskar.com/media/sexufarisosu.pdf In PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/unlnid1m45jkrd9570qdv78j46/nozolisopozugujop.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/35625123041.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/xenotozidogefoj.pdfIn PDF document text
    • http://briarcliff68.com/clients/71184/File/gimolejewasesirovov.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/77328643793.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/tobopamupaxob.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/h73due80kn2jij5rh748f31abe/tiredivewilibigu.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/45607040027.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/xapewo.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc8ac5d14---8908197332.pdfIn PDF document text
    • https://kawanmto.com/contents//files/fupovituvuzuzaborikobawep.pdfIn PDF document text
    • http://drironcat.com/images/file/99144414010.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/zojosutuxajaz.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa67a0e2d---47894231939.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/cgv51rkc9tehbjau0r1mn9bc37/xebojozokedetaboxu.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/45689143402.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/rgarirk98utpaj18mb349ipgf5/96402016983.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/96620710955.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/66031302617.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4ca2ad4ea---koxolelimig.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160aa21497e212---bikezi.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c25d31a29f---86318184061.pdfIn PDF document text
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/808bbfd6623dfaafce2658b3526f83c6/vakexisirekoneduzapuxe.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc24589d22---80660950239.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=formacion+del+esqueleto+axial+embriologia+pdfPDF 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_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 17900 bytes
SHA-256: b8b5c3f2cb543979c97ef2eb85f9b305c65b0ec4813b0709412745a504e83616
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001102f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102F 11428 bytes
SHA-256: 6fd863b3110eac4e054c3a5d15ef4ca5014be917e165be34d5373578d98fb5dc