Malicious PDF — malware analysis report

Static analysis result for SHA-256 88db79e0f5f9ff0d…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 20:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5b14934505b3d88fba3927544fb5b0ca SHA-1: ca72044dd768f5758145bc07dfa3b4d5e4f6a572 SHA-256: 88db79e0f5f9ff0dcf9de3fe430507d00a721aed3eeca5294c982d1511620c30
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable domains, which in turn host other PDF files. This pattern suggests a phishing or malware distribution campaign leveraging a chain of redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://fertilizergranulatorprice.com/d/files/tifopuwiduniluferurusos.pdf In PDF document text
    • https://m-isc.com/userfiles/file/mapiligilefedeluwa.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/lavekibe.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9b2675a28e---40544449661.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/7vf4piss5qfu3c4j3bpilq08gb/20253685551.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/523f60431e831be8e713b1048f6340a9/jejuna.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/af3db30e6eb725233a90e68ce9a8da18/12440902304.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5j7p3p0242dir9nto0kk90ggs7/34731139131.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8c1298684c1d8cd3e71cb5f5e4746456/noxajarijimakizo.pdfIn PDF document text
    • http://superazs.ru/images/news/file/pimuxutemu.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d32e47d61ab2310faf26e3c4bdc8e130/90263432463.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16116cff7e97e3---salifig.pdfIn PDF document text
    • https://songhong.info/userfiles/file/penulafezedupoxodixo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c283039e3c---firajiponajuxebevujadedub.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/16097e76663608---segedugogakoditinuni.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/78914944481.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083dc0a68fcf---54362138891.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/53873223454.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/16427792372.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/gegesirubowulofu.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/94601484772.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a49d19049---ripogiv.pdfIn PDF document text
    • http://terminsk.by/pics/files/desovetiralikanu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=the+causative+pathogen+of+typhoid+isPDF 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_off0000d5cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ede1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16624 bytes
SHA-256: b3af1efee1c370c23a2a2febe14b254ad2ad7b912817ce861ba2f62253ac8753
font_02_sfnt_off000118a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A1 10996 bytes
SHA-256: 2372352ef9a53640af834ed3749bf909e5851e90851f0c6f7a2b6738948d6ee7

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