Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3758aecac1f76be…

MALICIOUS

PDF

84.2 KB Created: 2021-07-17 06:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a21b63c34b40ca494980f77c81e6934a SHA-1: 342d54b6acbc9d8182ed89b430fc85adb31169f4 SHA-256: c3758aecac1f76be431eb4a241c8c2f7effb431f32f27e238c84be53613c129f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier also flagged this PDF as malicious, suggesting a high likelihood of malicious intent. The primary goal appears to be redirecting users to other malicious or SEO-manipulated content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://mclandpin.com/calisma2/files/uploads/jamidowitobokamoze.pdf In PDF document text
    • http://primehorseproperty.com/userfiles/files/tupekuxoledefajonajegapo.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/gozegizajudomekeladulevi.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076206c79d1e---11324737241.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/riforoxiloni.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/petiganamijofusiwukup.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b130a393a37---siwelafuliv.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607625e94d93b---64686144426.pdfIn PDF document text
    • https://rlvanstory.com/wp-content/plugins/super-forms/uploads/php/files/a040cbe2a1a073fb92bc4e5f3a7ee4b5/lolegapenabudopodo.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b80868437---3493488841.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/gitok.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/88655462593.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f94ea659c---jitusupitawimababidulanaz.pdfIn PDF document text
    • https://kuzeyilac.com/resimler/files/keladepijo.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32b48cc92---56335932620.pdfIn PDF document text
    • http://cartolmania.it/file/lixadukomifijuxesipulifa.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480dee5726---10161521377.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2l25ahe6em89qsk7hq8bram3hq/nejomopafulolos.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160e92c80bc8c1---tugizaranafavuzopanerodu.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/oql1vues4k3qbpf0stlvva0pb7/42594328752.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/60118415f69f46a39c180ef70e6c450d/sufifanagunuxo.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838cde640d8---rodaresopinaril.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/1g4ip0jmck4grtacdq74eboqm8/27195846889.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=construction+engineer+interview+questionsPDF 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_off0000e6c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C5 16316 bytes
SHA-256: 44b834aafa32de90062b48709b56df83cc4c07c2d672bfadcd53424f533bf821
font_01_sfnt_off000110f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 10628 bytes
SHA-256: 0e4ffecae22001d8599c530e52bc4ee175b1810c573fdde37c64feea059ac3d5

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