Malicious PDF — malware analysis report

Static analysis result for SHA-256 e858f2c9dcb2ccb3…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 23:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 96c6b8cea8babcabf8e59bcda5322f8f SHA-1: e4c1ef2e290a1d34189574f342ffd51b1efef631 SHA-256: e858f2c9dcb2ccb3940ce70c0d5cca6e9f4430170ddbc1ec5cdc7be2faac9272
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to download further malicious content. The primary attack vector appears to be spearphishing, with the PDF acting as an attachment designed to lead the user to a malicious download site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://chithanhplastics.com/uploads/userfiles/file/doxofelovo.pdf In PDF document text
    • http://myblindz.com/fck_user_files/file/mekumasuzopanedewuxapavu.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/97767327713.pdfIn PDF document text
    • http://world-green-hope.com/uploads/files/56500540991.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/31311572916.pdfIn PDF document text
    • http://clinicaveterinariacittadivignola.com/userfiles/files/23272805248.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8894cd98f5f59f85b2501eae1414ca93/tidam.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/28158011155.pdfIn PDF document text
    • http://rw-hse-businessconsulting.de/userfiles/file/74822330810.pdfIn PDF document text
    • http://maxbrio.kr/files/files/fanujubuwa.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/48039432410.pdfIn PDF document text
    • http://humanlitech.com/files/files/pesumedojozakirub.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7f535171a---44382589071.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/pisibiz.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/43412768732.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/31671907432.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/26250820353.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/vogurolitozipepaveg.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/155b679a3d651072250a92bb42eb6b4d/14466403835.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/98187154525.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/giluxuka.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/42675520520.pdfIn PDF document text
    • http://myphamasia.net/upload/files/buguvebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=wallpaper+not+fitting+screen+androidPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/12a507105a3087423908d8b960450b58/23131963768.pdfIn PDF document text
    • 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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 18112 bytes
SHA-256: 6d2f6cc61301347b0b12b39724260a411c99a1b5f90755f43bde8a37c581aa0d
font_01_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD0 10788 bytes
SHA-256: 417214ff58e0b36b6e45212ecc82de6fbee691f30a6c3713cf0c3ba8feac9bf9

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