Malicious PDF — malware analysis report

Static analysis result for SHA-256 5681f5dffbabe673…

MALICIOUS

PDF

85.1 KB Created: 2021-08-16 00:07:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 8ec747dc5f49fbaeb77df58faf7a8756 SHA-1: 29512d30ecedaeb0671a8778e109bdbbd8de358b SHA-256: 5681f5dffbabe67348a0f58982357348753cc5fbc3ba67e5807b6a64fd041334
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload directories, indicating an attempt to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/20oa0o30jgtsgorubbpm789t0b/fifefekonepiwizu.pdf In PDF document text
    • https://heuresromantiques.com/upload/files/ferisokumomamikaw.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/gopuwejetagarufoselojot.pdfIn PDF document text
    • http://deltastal.ru/userfiles/file/22515576976.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/3nqgnavc1u6md4geca63cio6k0/79474235783.pdfIn PDF document text
    • https://hanurichurch.org/ckfinder/userfiles/files/19480758064.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-4-30/20210430195614414620.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c160a17da45---lonedisirexowo.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/wamomadowapefevadigo.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/kabexuzotanawa.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160897722d512a---36995560248.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/lumidemitupofizoxenumu.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/92738861323.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/ef94a6e4cbaa361a0dc11b2ea5fc0c35/duderosozipobotunelul.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608218a47bb68---kojodutevoselinoxape.pdfIn PDF document text
    • https://echipamente-scule.ro/userfiles/file/filixonexib.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/ad3b3c7020d2aa705ade9c4c19a8bf4e/54996286739.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/24/file/20210524_144252_171.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160ccdb4b51fc4---70325026191.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160a1922e1ad4c---fisuxamaturupalujomete.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062215474873499.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f15a911ee---36050291011.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/37622553764.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chloroplast+and+mitochondria+worksheet+answers+colorPDF 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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 10988 bytes
SHA-256: d715adcefeac649598dc425b721b130e84445edcfbcfb6466f6e4d4e083353f0
font_01_sfnt_off00010334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10334 16588 bytes
SHA-256: e8cfa62a9da330ae8f4041cec8b9129fdbfb5656753f797f93275e0c6a58ffa2
font_02_sfnt_off00012d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1