Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c41192fbbc86ebe…

MALICIOUS

PDF

86.5 KB Created: 2021-07-06 22:20:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 31b92c25d1b10db37f3ff320e84c722a SHA-1: a66a7ae5cb1ce2ffe039e750924b9e3f62e00109 SHA-256: 4c41192fbbc86ebe94eb1869a966798bf1b6bae34c156a60604262ea6e88b335
156 Risk Score

Malware Insights

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

The PDF document contains a link farm with numerous external URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to lure users to malicious sites, potentially for credential harvesting or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://arerp.kr/data/file///vivixipinuburow.pdf In PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/17166e8d2178ba33f517ef916ade065f/6820254609.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160763301115a9---21818161519.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/61773905900.pdfIn PDF document text
    • http://jerilyndavisrobison.com/clients/870655/File/woveg.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/puxapuwativakizaxiwin.pdfIn PDF document text
    • http://one9five.com/userfiles/files/gasorukebo.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079182898a6a---paniki.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/selimobaxofosilim.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/vubawivedepovegidudogivo.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6207d1fbc---lawal.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/69600829691.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210601200157.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd474f99bca---rigurerota.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/ra8i8v0q0lp3cotrjo4nfsut20/21468862874.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/71982650438.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7382e4fb8c0965c3b677f1884332ccbd/nawuf.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/6366ipesb9l93ehbq0hjisa43r/papawisosivuvevekelu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/pmiqadrhd67l3emoqaieriki69/xovopuxivok.pdfIn PDF document text
    • https://stillwaiting.org/userfiles/file/54470379993.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2d684ac2814b79900346c89fcb91b8de/34737158590.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/negaguropujiw.pdfIn PDF document text
    • http://bjjiffy.com/upload/wevenogeto.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160777c3114713---10971941842.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mha+movies+in+orderPDF 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_off0000f0d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D3 10428 bytes
SHA-256: 90dd15f0b6f45a3368a46f00e136ad02a0a23bcee65cc28167e28642f7298665
font_01_sfnt_off00010840.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 17360 bytes
SHA-256: 6be2835a702808e242119a54dddb4cfca1731ca206c4fee7155a5eb5c2101f10
font_02_sfnt_off0001350f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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