Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8ea4c6f63c563c3…

MALICIOUS

PDF

86.1 KB Created: 2021-07-01 16:05:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c12fe6b2482df06c21c17a5f73c7cd4f SHA-1: b7289c0a319682c6ec504dc2e7a00de58bb698b4 SHA-256: b8ea4c6f63c563c39f1070c3042a3c038cbd4f27f41928b69f1ca78fc9f91e65
164 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content or downloads. The presence of a 'download button' heuristic further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/9iqliie023518fr7f4cvtarhg0/kinixosaxukal.pdf
    • http://maekuangudomthara.com/ckfinder/userfiles/files/63452770892.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1af91761f---pudakurosonodogoxuxa.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d3935d0a2---4441720269.pdf
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c2675af52b---70637546594.pdf
    • http://cephedanismani.com/images/pages/file/76851881303.pdf
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/vl9mhg0noaiijuja45hdohsehs/natukajapasibi.pdf
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/abe4eda7559d224b5029c0ba3dbaa6fb/zadivozope.pdf
    • http://aqbnb.com/uploadfile/file/83857574865.pdf
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/98f3b722ddb713e106ba56b05249f8c7/gufifupegajiripa.pdf
    • https://chiuman-hk.com/images/file/3887710635.pdf
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/772319083571bd1373c0c6f2cd635ef8/35198414664.pdf
    • https://pametnidom.hr/pametne_kuce/userfiles/file/177911380.pdf
    • https://pet-fashion.ro/mm/file/juvozezubebuwib.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070006c3b27f---juzanowugavow.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3228247cca794e6d266c95f41bc3eedf/zozir.pdf
    • http://bright-inter.com/file_media/file_image/file/fewasiwuk.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160adc44806752---53160352594.pdf
    • http://qianxish.com/ckfind_image/files/tukidekemuxarosa.pdf
    • http://logistra.fr/ressource/site-image/files/vatozojimawime.pdf
    • https://aadhaarretail.com/administrator/imagetemp/file/supafepubojabakasozezigon.pdf
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/ookekceevbbd6odkr56covn81m/dujaguzoto.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=ielts+listening+practice+test+2017+with+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edbf.bin
48e2ab1164cca4ae6a9db19b750f8c1eb59fd5f2a82865f62fc135472d83d723
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16904 bytes
font_01_sfnt_off0001196b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1196B 16792 bytes
font_02_sfnt_off00013182.bin
8cc1e6428033da9ea8d4aba1032e65e40eead000fd0eda049ebe25da31a32f04
pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 10916 bytes