Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a188c45cc6d4e5…

MALICIOUS

PDF

81.3 KB Created: 2021-09-08 12:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 19f96d811d6e24c375268883a98b0f17 SHA-1: 9ef2a8993f780c3bbdecbbeb84c5d56d5e708a68 SHA-256: d6a188c45cc6d4e5b96c05f1a898b6fd3c2623e4a6bc64988bbb352aeaa0df40
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e486fab5b1---luzijusaxosikud.pdf In PDF document text
    • http://compufoxmail.com/userfiles/file/gasutawimoxaf.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/17934895755.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9e60b435a---61424094741.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610e9d6f96c4b---kiwejofadovetipinegukez.pdfIn PDF document text
    • http://didula.com/img/file/28078843806.pdfIn PDF document text
    • http://unsersohn.ch/images/file/puloxafefinarabuxetagor.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/pomuno.pdfIn PDF document text
    • http://samrayburnclassof1980reunion.com/clients/873185/File/44740366037.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/71255761265.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/bea8dc5743c1ed67df2d10aea57bc7f9/fajagutaxagepesekapod.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11558951d---panezujeratabofivesavabo.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/80688052317.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/60996874487.pdfIn PDF document text
    • https://iphone-odklep.si/vsebina/14488605853.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/2452ecb4f4a0549ceda157893a574fca/sisikewifufutetaxas.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1fd2ab5e34---rironosafogevovoxuguxabis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a075beab8cc---rulodasufafumigakovulutux.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/68845979949.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/dedalapuwutusa.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/20063207774.pdfIn PDF document text
    • http://attlas.center/userfiles/file/19134670467.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=social+status+in+sociology+pdfPDF 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_off0000dcd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD7 16264 bytes
SHA-256: a6391ad9da7ce1dfe87d76bcbbee9c18bcabbf307b7801ec458e426ad700eb54
font_01_sfnt_off0001066c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E83 10852 bytes
SHA-256: 38dbf10cc0392b9e27c1deec68e7bbd7dee351dc41ff1f8ea1e93447d8b37ddd

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