Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7a4fbf00a1eab52…

MALICIOUS

PDF

89.3 KB Created: 2021-09-04 10:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 61fe940df7a1664cf455e25e486d2919 SHA-1: 4f25b6eda37898ca3cb64c712fbb1ff854a1e051 SHA-256: d7a4fbf00a1eab520719505514139c7d5b50a2877ccf512644e96cbf1cc50b3b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites, suggesting it's used to redirect users to malicious content. The presence of link farms on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/18172d90b9b66fff63e4161cc1464977/defobesuwonizud.pdf In PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160800aa622f61---welowi.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63ed10566---44084997976.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b015195e082---wiminenanalot.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7ec7ff23bfc7093ce9e17a59aaef1923/24718487454.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/19876158601.pdfIn PDF document text
    • https://flying-vikings.net/UserFiles/file/fesebig.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/jevuwarixipagula.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1626197028232874153.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/2713b8de7fd432d53ff7711ad7021a76/27049292251.pdfIn PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/37235524775.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/1d4b3934dd9c93f7427ed668d24a47d5/pugunejimol.pdfIn PDF document text
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/22025437275.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/fifulavusupogiwixab.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/jesujuvavamabaxobujaw.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/43539649971.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/ed06816fa6bfdda52d56eca671b04d94/3496605675.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/62971472522.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/jusapepimewageleneb.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/1361636931.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/lefipebetojikorefa.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160943d2b3a97a---miwum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=g4+sustainability+reporting+guidelines+implementation+manualPDF 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_off0000f0ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 20124 bytes
SHA-256: 4543aad6e010b62fd6729925e5a2e9ce049d23d979053606b3233cb289aeb5d6
font_02_sfnt_off00013d37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D37 11208 bytes
SHA-256: 1590bf9cdb6153e0289c0d2a4b6a456a11b32d3494c5d6e001e1a6b43dea6197

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