Malicious PDF — malware analysis report

Static analysis result for SHA-256 8499a44a43711851…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 23:15:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a7990a8843ea6cfe4f667d8a7788670 SHA-1: 228eb1d9a44fc2ab45d97f2ba10790bceaef24fc SHA-256: 8499a44a437118511c4b3d4fa1be425a5c60d3c0e5ecc5fa5e94d630144f129f
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to potentially compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The embedded URLs, despite some being marked benign, contribute to the overall pattern of directing users to external, untrusted resources.

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 http://abwmercury.com/uploads/files/berixijuxejox.pdf In PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/xazano.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/jeperuvejuj.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/b9e2d190755b4fa0427b032a617c0ede/pitafutudufuduv.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/pisurojuxipufisoted.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/l417blnnnlckt7b7vbgbi6etke/potavat.pdfIn PDF document text
    • http://eko-baby.ru/userfiles/file/vadokavodezavabit.pdfIn PDF document text
    • http://sunway.me/ROOT_PATHuploads/file/012122302216.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/sipavoxejupi.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/cc3229282369533a5f4c1ce4216293c2/valaxal.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612eac41911bb---12213732958.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/33259332735.pdfIn PDF document text
    • https://luckyfood.itweald.com/uploads/files/6137a073000c4.pdfIn PDF document text
    • https://esofagopisa.it/userfiles/file/21675449052.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/98276443255.pdfIn PDF document text
    • https://tele-video.ru/upload/files/pubavowurawazi.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/e8f6f3b7c5ae713b27be1957c36def96.pdfIn PDF document text
    • http://contelex.it/userfiles/files/20368901630.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/votuzavelamiriren.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/7833352851.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/61814817326.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/bovupawawipiki.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/xoworaduzowerobana.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=deltanet+android+appPDF 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_off0000e9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CF 17624 bytes
SHA-256: cee13a5ebadb1c1348241a81c1962bbb67d74bbc7f50fc2090de818186135cbb
font_02_sfnt_off00012eb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EB4 10216 bytes
SHA-256: 66aa5affd62b42575ae4c4c99ff4bee14da10bcea1ac0061fcf9c910be9d8b6d

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