Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab33f70b52909811…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 20:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 63975f565a1bca75085d2c473a992e24 SHA-1: 267512ae83271e8bdcfd24f133c8ac1e8514ab88 SHA-256: ab33f70b529098116d0019dd023609f6a123546f58c664076c8d0643041d7ebd
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs that point to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://cructi.ru/uplcv?utm_term=eset+antivirus+android+free+download PDF link annotation
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/15748694503.pdfIn PDF document text
    • http://playoz.com/ckfinder/userfiles/files/50232422652.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/gewumupifodadanevabanix.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/xezeva.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/talopedopolotawefexemi.pdfIn PDF document text
    • http://esejsc.com/upload/files/98643031411.pdfIn PDF document text
    • http://cleangroupbd.com/ck/upload/files/fobukupigijot.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/wusemapesur.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/devadefogadasigetaso.pdfIn PDF document text
    • https://viettrungson.com/media/Files/dimotek.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/25665188134.pdfIn PDF document text
    • http://epwuae.com/userfiles/file/66438706559.pdfIn PDF document text
    • http://shacklefordlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuzawibubamabalotonidipal.pdfIn PDF document text
    • http://nj-rshb.com/v15/Upload/file/2021932230118635.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/83663a4d5c6ef5a756f0e5ab8efec8a0/pujasademexejutafon.pdfIn PDF document text
    • http://tartak-monis.pl/tartak/images/file/detesogifarineruxipirefe.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/fec92d2c01796bb18578b9ecae6034d1/29407817110.pdfIn PDF document text
    • https://textolinguisticsolutions.com/upload/editor/file/watebuxabajojazebosixobaw.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e306188861---47286352317.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/gigolijalijananuj.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_off0000dd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD85 10580 bytes
SHA-256: b01ff430f12fc33f8d2dff17c60d213649d75bca09ebd23fbeb71faad5c9e315
font_01_sfnt_off0000f5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DF6 17588 bytes
SHA-256: c32d1bb9ce4013e54ca180285646642cd8031ea130a56d96d4800165e1cb0242