Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71aebea55b2926e…

MALICIOUS

PDF

95.0 KB Created: 2021-07-30 21:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 79a6d533f4b83dd8d2c73a82580d7e36 SHA-1: 1169e3806d4d0243e31e96a13411c0089e6cabf4 SHA-256: d71aebea55b2926edd9dfa08b5fa8824daa954c099041cfcb666e5f697712b64
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier, indicating malicious intent. The heuristics reveal it functions as a link farm, directing users to various compromised WordPress sites hosting PDF files. The presence of external URIs and IP literals further supports its role in distributing malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9934

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://simmsfamilyreunion.com/clients/9/98/98d47f1658d09d39d77ba56043454c9c/File/11420915010.pdf In PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/d790036fbd2b2ddf750eb071a37addcc/nigapane.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab376e37aca---83627968551.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/52142599890.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/56853562262.pdfIn PDF document text
    • https://www.movingwithmagna.com/wp-content/plugins/super-forms/uploads/php/files/7ab59c87006466d100830ab8d9ec1b18/56438754729.pdfIn PDF document text
    • http://alexandercdg.com/clients/36029/File/dejukev.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608374d85ec76---12667589227.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/bd2a03f93e81e6e64068205d545081c4/67499243934.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7cc2766ddb.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e35091a7a6cfe19d0428b43205ecac7b/mujelawupemikolidubiwu.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbac4c1446---butatafebekuvuwavunexe.pdfIn PDF document text
    • http://lbhs1965.com/clients/6/6b/6bdd8f708684a1f547efbf97e1630fe5/File/letolepasunagon.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/vupez.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/17344868307.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021051704583625.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/5ab86bf60eee6d6c63ac0531eca0258a/42634400190.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/58b3059e40cd3d09c5cfe735ce0075cc/goxixolemu.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c301bfbdd6d85d3e5eedaf6e3036de40/buvidivivoroposofali.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/q6oec8vdu1uu52q7buc0m1pvl2/39721611584.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16080be4a34521---wawomozasini.pdfPDF link annotation
    • https://zzarosiscarampola.it/file/bemefiraxasewomewuzoxam.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941e5e32818---33458483055.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=hack+wifi+dengan+terminal+emulator+androidPDF 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
stream_006_off00014dfa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x14DFA 19012 bytes
SHA-256: 3c4024f28566c5be15a9b9bc3a571a279d5f2610873ff1592b7b5fe4e82958f0
font_00_sfnt_off0000eaa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA0 19184 bytes
SHA-256: 4a5157039bee029d280b1ad52e07ce716e7cebb5d8766126ce1341a538616579
font_01_sfnt_off00011cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC9 10920 bytes
SHA-256: fbb7c135b7ad2023fe79ab45d0a94d32a49ea616f5f6f4f0ad7aa6cd9410de80
font_02_sfnt_off000135e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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