Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1df2e99b33e634e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-10 18:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 13c5947cccee8307d38441abe08fa987 SHA-1: 2f0782132e6c40fec04ce88110310b37f61033b7 SHA-256: d1df2e99b33e634e556e79195cba6d2ba368d90fa9be44abe75c142db0d80043
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a link farm, with multiple distinct hosts and UTM parameters suggesting tracking or obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=how+to+block+incoming+calls+on+android+phones PDF link annotation
    • http://windowsplusllc.com/ckfinder/userfiles/files/13050158472.pdfIn PDF document text
    • http://tsraccountants.nl/mailing/images/photo/file/31759558626.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320e7223b3d---73081886106.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/rupitorazi.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/kajafapowedogafifum.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/51263641282.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/nunitiwuboxajibuj.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/93281902874.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/74973716971.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/39984863327.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/wagagoporekugagizusudobe.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b401068af---17911645210.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/80724965869.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/87795126087.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/83570840326.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/jolesiturinuf.pdfIn PDF document text
    • http://podushka.by/files/files/59901980112.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3e37bf908---fuxemukizixot.pdfIn PDF document text
    • http://air-con.ru/upload/files/21194811521.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/20921410658.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/fumut.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/geduxewupixasokapeda.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/80192062001.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/xezufimaraled.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_off0000b44c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44C 11268 bytes
SHA-256: b5c694d80ff1de7dc4d1b7819fb7f98b0820d90ddc446f85f2251a1aaa16dab6
font_01_sfnt_off0000ce29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e63b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63B 14908 bytes
SHA-256: 906e0eef13bfc0af45312d13428283bf35a369aa370974bada697b78fedf9d6c

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