Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc2ce8ae4f4f6df2…

MALICIOUS

PDF

82.0 KB Created: 2021-08-17 09:34:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 72f4ef0c7be71fdb84dff7f2a679eedf SHA-1: e0ab7005d6af3bbf94839ecd639628b8a1568925 SHA-256: dc2ce8ae4f4f6df28fc5d3ed49904398042cf86786ba2d05ba45d1d8c7c8625f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The presence of multiple links pointing to compromised WordPress upload directories and disposable hosting further supports a malicious intent, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sakem.org/userfiles/files/rowowerabavebusi.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6168f3901a---18239972852.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c41aa7846b0---jitowil.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xewutinu.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/15953794969.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/6420d9a2da4bec6d2e79c996d180a1e5/sibapiputuwinosesimuliki.pdfIn PDF document text
    • https://farmstead.tw/farmstead/upload/files/tejorerevumupajiwuro.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/d924e443c3ccf98c1e5a8512d7d552b0/furobaxogadubazaleji.pdfIn PDF document text
    • http://henca.com/files/details/file/47877933616.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16203471941693.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/9f536b248e25fbc5813079a06f3b6c79/31995005616.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084c6b1f2829---dalejelifikonutaw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160796af406f70---15683364597.pdfIn PDF document text
    • https://www.travelknowhowscotland.co.uk/assets/js/ckfinder/userfiles/files/38243398595.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/numifofudi.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/754dead7d063fdfc6e20415e00bccd8e/dubipedal.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba69d7b665---jabekoxorala.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e000e88bc---ritososubuvigaraja.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/13a7f365ffb93be4036d569f02816688/dabelurutumofovusozilisi.pdfIn PDF document text
    • https://banktapeunadana.com/tapeunadana/bank2/admin/userfiles/file/63518738362.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/zezutesilu.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/pumirol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=2017+yamaha+r6+parts+cataloguePDF 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_off0000d950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD950 17616 bytes
SHA-256: 23807811071e8e02669b68ab22d9ce3da24576775c61ae9881a4ba2a0a7a74c9
font_01_sfnt_off0001074f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1074F 11252 bytes
SHA-256: 1922767b67c57f945a54b962769dd234fd3969aa0f873d1b13ee68fe2224afbe
font_02_sfnt_off000121f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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