Malicious PDF — malware analysis report

Static analysis result for SHA-256 cadc6f97f681dbda…

MALICIOUS

PDF

82.4 KB Created: 2021-09-06 00:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ab67549e63eddc6fb505ec2f7adaa69 SHA-1: 2f343e66c862e4f7799074e3602841292f3eeab6 SHA-256: cadc6f97f681dbdaa22b8bb78a37e56314a123967a632056477f9007b0eb6f9c
196 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests potential command execution, though the specific matched text is garbled.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://aslimitada.com/userfiles/file/vokomukawizopilerafepubo.pdf In PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/stcjb31v8ud4vgis167ncf1ugn/1441881429.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/560937988.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/fetujikupo.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/36019800051.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/guvotutexivamewajeg.pdfIn PDF document text
    • https://brod-plovdiv.com/images/fowutaledejidanuvesovak.pdfIn PDF document text
    • https://ezastupitelstvo.sk/editor_uploads/system/files/16594877013.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160d78102daa7c---nefukanuvupegoko.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/ramojegapebixu.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/97207213509.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/eklfief5tqqd530hbk34hqjslg/97806590763.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/f3be89f92faefa9ba1435bb1e57be175/73791277459.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/76348372045.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc95ab14c4---nezinuxilujaf.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/wawavag.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/joweripavivok.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/oeqg1u9chv3dan795kknvsn2lh/45517546384.pdfIn PDF document text
    • http://evola.it/userfiles/files/kigibivoxibarit.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/49077539b19a534832fbb100352e7946/pogekilar.pdfIn PDF document text
    • http://stallingreunion.com/clients/a/a3/a37dbb3dca22f8cb40f44de83fe48269/File/rulekozutolupasabuledazas.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/majezumewufuvilunuguf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=preparation+of+chemical+solutions+pdfPDF 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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 18264 bytes
SHA-256: 4539788d3aed338d118339922edbbdf0a2f0da7243cda737a9b000c22ba3b9bd
font_01_sfnt_off00010add.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ADD 10984 bytes
SHA-256: bf365ed23d387f396f3ba0c2d5a03151d65748f945ae92e5b0ea3f8202b57c6d
font_02_sfnt_off00012423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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