Malicious PDF — malware analysis report

Static analysis result for SHA-256 178530bb24028b21…

MALICIOUS

PDF

77.7 KB Created: 2021-09-08 05:02:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5a86baa06e92d76f936525badafb0251 SHA-1: 5026496cd053b500d3ed7b1b92bb0e14c58dcfbe SHA-256: 178530bb24028b21782e3eab394f3df5384536486656f1a9055c065d00f20e54
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one pointing to a raw IP address, indicating a malicious intent to redirect the user. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The presence of JavaScript points to T1059.007, and the nature of the file suggests it was likely delivered as a Spearphishing Attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 https://drafthe.ru/uplcv?utm_term=fibras+textiles+naturales+pdf PDF link annotation
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609dedf587992---sezemulitesifewefupuwibiw.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210520035851.pdfIn PDF document text
    • https://e-midas.ro/files/file/sogigusinedabomuni.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/fotitolamozukurotaz.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bimifumufolapotose.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e6a9f5d475accf747a57b0e04bf29389/14169483995.pdfIn PDF document text
    • http://myarrahnu.com/mo_images/files/95985068892.pdfIn PDF document text
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/32592717926.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/porujixosedabunefoli.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210809165733.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/fesikokulosonukes.pdfIn PDF document text
    • http://happypalettebnb.com/CKEdit/upload/files/taxito.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b56e41e516---72992273762.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/ranigirogolonirugog.pdfIn PDF document text
    • http://flomojapan.com/upload/files/zujirofiviwurutizoz.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/19f9157a63ab8795234f9513d5b44580/7491073240.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/vumoxopijagitiwizufomimu.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ab231bc67d5---jaxit.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/u1iu26j7jc072vo5m079thofb8/21222343347.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/bemofofijeme.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944d3ec337d---gamelajulobixup.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/160f74962275a9---dovakefidol.pdfPDF link annotation
    • http://outspokenholland.com/userfiles/fckFile/20210516101523.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_off0000c97d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC97D 18860 bytes
SHA-256: 5eeb513fe4a043223ede5a9c903b2f89cffc36af8b1b5948a47036157b630a6e
font_01_sfnt_off0000f948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF948 10688 bytes
SHA-256: 91e92a10d924923fd48162321af606a6f659f8d8869a6cd616c1928edbf6afef
font_02_sfnt_off000111ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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