Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb704e749ea1abae…

MALICIOUS

PDF

88.1 KB Created: 2021-07-19 04:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: b151ba58ccda82e8d457654532582172 SHA-1: fd4889448e010e0b3639a14e5cc6e91187c177a0 SHA-256: bb704e749ea1abae3693d535a9e4f1a7e601cbd6f8358b5f87195391669e3e3b
176 Risk Score

Malware Insights

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

The PDF contains malformed streams and numerous links pointing to compromised websites and disposable hosting, indicating a phishing or malware distribution attempt. ClamAV detection and ML classification strongly suggest malicious intent. The file likely exploits a PDF vulnerability to redirect the user to one of the listed URLs, which may host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://hijaulumut.com/contents//files/7733298126.pdf In PDF document text
    • http://www.abcklima.hu//data/editorfile/23644192176.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/paxexegejolafuzonomumelip.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb57f57878---movawezuferawebuw.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d962cb48e7---menifokozex.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b8fa70d9f5---346623518.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/1960505683.pdfIn PDF document text
    • https://aspirans.com/files/file/sujadij.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/72126150833.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/redig.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/60fa70937158ab216763ccbad54aeac0/15164809717.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/rewuwigafesozotiraxazamav.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e02ce006d56---95485804394.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdf8fbd512---22727250413.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5ad4c071---23075205308.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bc9c5b19e---kisinuraxepisoxiva.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160914dab5eb2f---kejetubibar.pdfIn PDF document text
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/99daa7a3a08278438d0ef29352c1b3d7/judufovijovumoguvadapi.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d93b87c5c6---mugigirazubukekunapudali.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/fvo14a55udfvasd416s4iqalbq/ximufikaxigakopiko.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16079e3909942b---bazuviwexirorokivoleloxax.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/bebajitadijogizedame.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/87811835173.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/tiveregakig.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/3d4ferbssbnlbcl3abig2dm44m/wufazudazisabiw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=head+first+python+pdf+free+downloadPDF 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_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 17340 bytes
SHA-256: 395a4e4339c6934c0430eb8288af618c2d3c4ce07f12ed3ae9502a75b957bae0
font_01_sfnt_off00012218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12218 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A2F 10788 bytes
SHA-256: 10566875ee2cc133bf18149d62eafd382a72f72e66536f37a5513962af125778

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