Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89769daa96646cc…

MALICIOUS

PDF

76.5 KB Created: 2021-09-07 23:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 08e701098717b642d05dbbc0364b7ca8 SHA-1: a109663fa70283d6af9fbf14cd3f61609aa1bd33 SHA-256: e89769daa96646cc8fd9e52d06749e006e178860b7835097a4137a3c2a5d15a9
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites or disposable domains. This behavior is indicative of a phishing or malware distribution campaign, likely intended to lure users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://naoshima-tours.com/images/blog//file/malugap.pdf In PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/791944bc7c8fd1fe90398389339ec769/30876277112.pdfIn PDF document text
    • https://capital-publishing.com/ckfinder/userfiles/files/tinugijoj.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/lusonalovozobowe.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607475581f6fa---tapaboboxojebodujuk.pdfIn PDF document text
    • http://stananddiane.com/clients/6/67/672a2699e369d648dd23e03de9deda78/File/1458864558.pdfIn PDF document text
    • http://praguetransfer.com/files/file/babopeget.pdfIn PDF document text
    • http://sanmarinreunion.com/clients/c/c0/c0747301521b2fcd71a0106c9132c7e7/File/25249986417.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612644a3b6c90---9385892853.pdfIn PDF document text
    • https://migger.dk/userimages/file/nasegazatiwitalajazarome.pdfIn PDF document text
    • https://cerquilho.sp.gov.br/public/admin/globalarq/uploads/files/71017358066.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/6895e1591146e9945429a675ae6a7736/69312108027.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210716_061508.pdfIn PDF document text
    • http://skomi.ru/img/files/file/68432930290.pdfIn PDF document text
    • https://www.terraton.com.my/ckfinder/userfiles/files/48030485511.pdfIn PDF document text
    • http://generaldistco.com/images/file/jolenosa.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/61203032985.pdfIn PDF document text
    • https://wsbtitan.com/images/file/37192487109.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160982f869ead3---zexazojed.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c7bd2536563---77566305109.pdfIn PDF document text
    • http://podlahypilat.cz/admin/file/lujisefap.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/kudesewanesivav.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/076e9ee93dd6f0dfb9c185d365d07480/50683586749.pdfIn PDF document text
    • http://djapm.com/userfiles/file/79963452906.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dc34ce5041e98ec7f6ee5ea379f0bae3/73832242802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=novation+bass+station+rack+manualPDF 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_off0000c804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC804 16908 bytes
SHA-256: a1ab51e46ad83c6bc48849fb460c14a62033d9b1859182c414d143cec623c8ce
font_01_sfnt_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 10632 bytes
SHA-256: 466bacc8a278211846585a4a5bbb88f19a0739730dcf07ab6aea727041decbf2
font_02_sfnt_off00010c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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