Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f607630fbbd3e21…

MALICIOUS

PDF

96.5 KB Created: 2021-06-26 21:43:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6d0eaba68d17e35f8d27cc8061aff25 SHA-1: ef18fc5f5787958f747c49ecfa258d0510d84870 SHA-256: 2f607630fbbd3e215edc596b433e0b34884e0d0cf51504e8ed0f1b81ad16ad10
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external URLs, some hosted on compromised WordPress sites. The presence of these links suggests an attempt to lure users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 https://chcial.ru/uplcv?utm_term=hardest+riddles+ever+for+adults PDF link annotation
    • http://edgecs.net/documents/70701833902.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/edadaaeb38d2f7f68aef483f7c1e340b/jebogizanufomuxuxinupis.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/isfocm2joh9oc628i0lklrcjn5/duwubawofaxis.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e3c71ddf---57141590511.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d67fc671af---45699988746.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b62cd0967a---59565457054.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/jn5e62t8h5gq4nd32ipildt83j/dulojilemavusotedeperidob.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/wewawobabunulubiduked.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-5-1/20210501123418868375.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/b2ad2f6f3e8008e34cdbb21426136c81/17964667348.pdfIn PDF document text
    • http://fincasotilloviejo.es/files/sotillo/_repo/file/nugaxubewus.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160884010ea165---4692306835.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1a579d6d4---wibuvunuxunugafomu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160852da092c05---dajusojegozekiviminol.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16079749d43d3e---64642891067.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/2e5e5ab454d7affcc6a693e0c644d295/14961568711.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/42085991528.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/66409702568.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/004f1a3a845d5e7bb60ae39f81da8c43/viwiletavejigisugug.pdfIn PDF document text
    • http://jaatkinson.com/userimages/ginuraze.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/0d8c4d7cc6bbab59d9091a8c71f45859/firok.pdfIn PDF document text
    • http://maxtarget.by/ckfinder/userfiles/files/jafisuriwev.pdfIn PDF document text
    • 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_off000117c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C3 17392 bytes
SHA-256: b79a218d7a0aa78d1ff675e3f866cc3d222d8704fecea9604534a49186927e3b
font_01_sfnt_off0001455a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1455A 10400 bytes
SHA-256: 1816a8e31e672cb14a78461636449eed9cca4785b93eb1ebe18f12d4ed572f2f
font_02_sfnt_off00015cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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