Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a48c14ea6dbd54…

MALICIOUS

PDF

91.5 KB Created: 2021-09-09 06:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 794a1d8627adb482926952324890f7de SHA-1: 06c19724a2eadad166a8db147602151b42e7c7be SHA-256: 54a48c14ea6dbd544e6ee1098d747c5738b122b917527aa45501d7426fa0d1f6
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://stacjaregeneracja.pl/userfiles/file/ledunujot.pdf In PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/p169e78mdcegcsek6qnk99i6eg/gogubidagal.pdfIn PDF document text
    • http://thevale.us/userimages/wilidotetebetexujubafexa.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/koduzuvuvomav.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/28386270840.pdfIn PDF document text
    • http://www.rsvpcatering-ar.com/files/imagesfile/vasawog.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/70065912258.pdfIn PDF document text
    • http://zjhywt.com/images/upload/File/migapisakaj.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/vibopipok.pdfIn PDF document text
    • http://kaies.cn/upfiles/file/87177964102.pdfIn PDF document text
    • http://swapnakoodu.com/fck_uploads/file/zixagaxusabubulepe.pdfIn PDF document text
    • http://flomojapan.com/upload/files/213254566.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161390136168f2---vumizaberetut.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/42976168878.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/39912616425.pdfIn PDF document text
    • http://nissanotogovap.net/uploads/images/files/tezuvitaw.pdfIn PDF document text
    • https://priscar.com/documents/files/54657237207.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fcb920f2c---jowujosokuwitani.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/790508996.pdfIn PDF document text
    • https://bczenekar.hu/files/file/6294063390.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=jetpack+joyride+india+exclusivePDF 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_off0000f7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A8 11100 bytes
SHA-256: b664b95e06a9440c49a6bb8ee937a24c59400cf956ca66417bd05660eba0adec
font_01_sfnt_off000111b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B1 20832 bytes
SHA-256: f0236110d6da67f7046c3b5b7c8cba1dfd882b8c7e7ba4080fd6ab9fd5e374b8
font_02_sfnt_off000148b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1