Malicious PDF — malware analysis report

Static analysis result for SHA-256 59d141119f89de00…

MALICIOUS

PDF

86.3 KB Created: 2021-06-25 18:52:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c6b8877ce4b922fc691ed58782db80ec SHA-1: 6a4e0f84f9875460b0e4160a9d4369e072eaf93c SHA-256: 59d141119f89de00d3155a0a189d065d8633ee34fcca321ec397cd9b783c912e
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious sites. The file's structure as a link farm on disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/49452322291.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5510b7d47---towaluterubanugaduzisujan.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/162ed67450297c27a1af05cef9d46ec0/43799051187.pdf
    • http://coopmong.com/ckupload/files/62408974267.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/38672554777.pdf
    • https://almondzwealth.com/administrator/imagetemp/file/zijuxovidu.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a3537a289---regutirakepevesa.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea5fbe5e9a---jipoxunujipekavutaravi.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c9287e6e5cf---sebusozozavatisofog.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/2q1imvgt8ttnsjn1opbmi4tg5n/senikibaludij.pdf
    • http://architettoseneca.com/userfiles/files/1873843566.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160a65eac5745f---pedifigi.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6473c4dea---20212405507.pdf
    • http://activesolutionelectric.com/images/file/23916371386.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910bd0b9646---xejelagazikawusi.pdf
    • http://rsst77.ru/upload/files/52892360557.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/785f24d4133020bdeb2ffa98e498517a/dibifoganuvikenabuv.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160732d7b50a0e---zoletizomowedusixobaje.pdf
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c96604225c8---rokurutirisaviduzu.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9a271edf7d891b7de6aeeecf887fb06e/47096231463.pdf
    • http://strategie-online.net/catalogue_dynamique/file/wofefitusopineger.pdf
    • http://starlightcelebrates.ca/clients/4/43/43e9139217482d7666ce300faf566241/File/kewalelez.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=red+mustang+horse
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eed0.bin
3240d612bf3b2991dbd094d1adbe63909af1197c4af6b2550c21b065d1e637f0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEED0 10700 bytes
font_01_sfnt_off000106fd.bin
a2ce3d29beec4f51dc10d1c9e2d8a64f484f52eb1169e4b4311e0693e8d08797
pdf-font-stream PDF embedded font (sfnt) at offset 0x106FD 17380 bytes
font_02_sfnt_off00013452.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13452 16792 bytes