Malicious PDF — malware analysis report

Static analysis result for SHA-256 71496b7db2906f7d…

MALICIOUS

PDF

76.2 KB Created: 2021-06-09 00:24:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: e110d5ccdbf37042399aed7b46608f75 SHA-1: 3e5c050c4d17c917345a5dcc66a3af52731dd2cb SHA-256: 71496b7db2906f7d923a9fe33b7b50709643bf93e9b97a6e93760a889e1a0f6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the overall structure indicate an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://chcial.ru/uplcv?utm_term=barracoon+pdf+free PDF link annotation
    • http://jagodkaprzedszkole.pl/userfiles/file/29446711455.pdfIn PDF document text
    • http://altinay-law.com/images/file/rupeligupagebefowusolur.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/d65ba39ccc112996f7e9e86bcc963742/gezelusugukuninam.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160bacad359b76---67516042160.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/tqtkqicumjqpa6789n2m3iroic/95035061865.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/jenubususipese.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/23179902922.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/9cfd31c26718f597278ae739cbd074a7/divex.pdfIn PDF document text
    • http://intrinhgia.com/admin/webroot/upload/image/files/faxoju.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608050031dcc4---jubudijazitekokubuma.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67dad432e---didesuvulanekakurofawised.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1fdc1cdc31---musoxoxatagunamubunajug.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/29905079194.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f39d92bea---gamasaj.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a34dd85e5e5---nutuzejudemekifapapabenu.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/20967646197.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcabcc93c1---46249998360.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/19In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e673.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE673 4648 bytes
SHA-256: 6a669da689a86cb6292696ae7221d4353b143f7d564955b35b9ac578ec285c80
font_01_sfnt_off0000f635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF635 11452 bytes
SHA-256: 7d9e2d56754f65cedb3b81048041508dcd9967541dbfb366be3f7a31b95e907e
font_02_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f