Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7f416983733ba85…

MALICIOUS

PDF

89.0 KB Created: 2021-06-30 02:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f032a9bd75568e88bbaf55cd9bfbd018 SHA-1: 9e1c8500d4ceda7e60d2f998e77f06a5d1ad8d96 SHA-256: c7f416983733ba8507efc7be1495d5d8466d08cd0d5d40648f27ba75c1cfa6a3
164 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the document being a link farm hosted on compromised CMS uploads, suggesting it's designed to redirect users to malicious sites. No scripts were extracted, but the embedded URLs and the nature of the heuristics strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/eb655c5002269f0a5d26ef24640de702/tagegepodiwapedewom.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609074ee46a72---nidogiziburugedotilugiw.pdf
    • http://hondatayho.vn/images/ckeditor/files/18619744545.pdf
    • https://aquafilling.com/userfiles/file/56471472514.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e5a2e0f93---91579629799.pdf
    • http://elturo.ru/img/upload/files/lonim.pdf
    • http://tms-operation.com/upload/files/26013124539.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096ed1d36801---54560497822.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b2f934d2b24---zaval.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607283ea09ddc---xenojimuzelusoxe.pdf
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e1de8dbb---14338379315.pdf
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160970e8045113---zowofudo.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b733265e3---9912388740.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/99939489618.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a378384f704---81850670556.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e8e866f402---70813207953.pdf
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/mugoxeviluxitozevofum.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160ada92332a2c---paselomeguzelik.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1609091c4d2fc0---nebipaveboxojibet.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/9mfeubfqbas3ssunn7alupqve7/44284456689.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/05f7b573b41a91249f9643f07184862b/pumezopaxiruferikitarux.pdf
    • http://lakehighlandsrw.org/clients/863582/File/vemolakolivesezame.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=therefore+and+therefor
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e166.bin
2fdd4ee0ae70be6d8a3b98c1e4464380765fc08b900ae9dcfc20d15167620682		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE166 10108 bytes
font_01_sfnt_off0000f7e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 16792 bytes
font_02_sfnt_off00010ff7.bin
19bce296c9b0ff48d3839799fb6f1df2b03e351887336d169f277e8c8734f7bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF7 16172 bytes
font_03_sfnt_off0001259f.bin
ea684b6a680718dd16c4667e47c0b30c24f0a9ea022389e05953ac582bd6e4be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1259F 18176 bytes

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