Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0c821d9422983d…

MALICIOUS

PDF

91.1 KB Created: 2021-07-05 23:33:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eb09e18081dbd03b83d5db9980a88629 SHA-1: f30580a8d36eb2d2db7a4beba47a0a2286b24247 SHA-256: de0c821d9422983dcfc8f54c0d4d39a87ca0f967726881be171ff824dd2e647e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm used to redirect users. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://livinglearningandworking.org/clients/e/e0/e05af8355f71d8da3aa90f500b9284b3/File/vasere.pdf In PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/cs72dj6h1pl7735id3bl0bikiq/folewopamomaxo.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/67a5ae1afa8d8b69dd1c189dae58f37b/jogukiperewugenujugu.pdfIn PDF document text
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/6c71223a1745892694caac5b64c27ed3/fozunepoxaradet.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/besuwifokanabur.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/fasofifiloneretanevogex.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/48614195183.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/307b7869ca53aa599fff5112bc7e695e/ruropu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d39d9cfae---kidezifalik.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/bewexukupasa.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609e00081f0d1---63469611237.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/tixegapirufojorinibevetaz.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/5658430917.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/3e1f793f31c68ea4f44a1f96b62d7ef2/gisazajadatukebumusolu.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/33234117703.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5eaf208a45---33668508217.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160de047fb4885---15031700793.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/zukokuparisisupive.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3b0df297c00811ebce2e824ca3282d4c/satogemasanotife.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/zafutikolujalen.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/nelidakuwe.pdfIn PDF document text
    • http://bscartridge.com/pic/10407282918.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/df4bdae48e5b45a8a4ee479e0cf725f1/xewixilogotasirujavinoxe.pdfIn PDF document text
    • https://rockyshairsalon.com/wp-content/plugins/super-forms/uploads/php/files/inf1uur6b0rn8f7emise4h8fab/taginodem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=significance+of+a+and+b+in+van+der+waals+equationPDF 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_off0000ffa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA3 11264 bytes
SHA-256: 76c1e188f8c708ac9752e31be03c5f62dea6ce3c5f30b47236d82f97f15d6ab9
font_01_sfnt_off000119bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BF 17088 bytes
SHA-256: 979f9a57bc5f562c3d7c44f9210981764e4dbf0b05b93436ac4b47a55997addf
font_02_sfnt_off0001466f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1466F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1