Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8adf0f099e1130…

MALICIOUS

PDF

84.7 KB Created: 2021-07-02 03:30:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 8d5508760c221eb907e07ba43c11e029 SHA-1: e4a7b2b7208ef58a3163fc6f0f81a8ca1651eedc SHA-256: ab8adf0f099e1130b2bbb6cbb304742e040b289c47fbf87bfffb332610f65159
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the URL farm and the detection names indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/e61a0e5a067d313875a7f74c92bfa457/sedifatalaziw.pdf In PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607198dada4ff---wuropaweropovenotixebuw.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/9cce969e48bfe1f72ee6e26eb71f9a68/15871467022.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160b0850dc4002---fimuwidazukab.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/30a40b046e7829edb08947b9ec4607b0/nixapep.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609104cc35e08---pixukexuvixibiba.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/pqpfikbq1af942nfvjfto1v3r4/72908279931.pdfIn PDF document text
    • http://ozari-ua.com/files/file/matixebubanuvigunuriziz.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/nakugidozano1623514148.pdfIn PDF document text
    • http://pneusmarene.it/images/file/rebupiduxiliw.pdfIn PDF document text
    • http://ibb-online.ru/f/file/tinexisafozubikom.pdfIn PDF document text
    • http://sshs61.com/clients/6/60/60e739d5a8cf4a6710e4f064fd99417d/File/wimonogarasuwuxasadexex.pdfIn PDF document text
    • http://uhy-th.com/image/upload/files/35609024556.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/dafowuwumuvopejoxodebisi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/84635296530.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/3056934513.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/8i06992bmdd7kvd0kd9p6vk1u7/buvifus.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/81287935056.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/74385eb5b7bcb0146b156bcc497fb59b/89731741741.pdfIn PDF document text
    • http://clarasonic.com/upload/file/renedasekudux.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/b373d1ac206bc911e951ead23aa2b012/nebeboreligumaxiwubowo.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160b1129eb9342---55368623792.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c4986d37b0d82913b81b5b11e4902b1d/tadivifofabofetexip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=armour+thyroid+side+effectsPDF 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_off0000e85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85B 10624 bytes
SHA-256: cacbe28edc8cbc739713775a17b4ff59d8f5d3a545cf165273ec0bcc74397efe
font_01_sfnt_off000100c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 17068 bytes
SHA-256: 2a614bade160daf8ff21158451ec4656976de235c75196b356ec2ed0e94c2e2f

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