Malicious PDF — malware analysis report

Static analysis result for SHA-256 c68b7ab73f49aabe…

MALICIOUS

PDF

89.9 KB Created: 2021-09-16 09:29:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 99a57781ea12f97ebd7a0e64a9947786 SHA-1: 59d88872e722fd2ee2001ab69d00734be6f05eed SHA-256: c68b7ab73f49aabec794136542931424c4f79e6a95659770829e92b314f62c38
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous unknown URLs, many hosted on compromised or disposable domains, indicating a phishing or redirection attempt. ClamAV detection and ML classification strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. The document body is heavily obfuscated and unreadable, providing no direct content-based clues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://geologicatoscana.eu/userfiles/files/kuwosasezezagijubibadi.pdf In PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/89548113229.pdfIn PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/safuwe.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/64674105050.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///viluwife.pdfIn PDF document text
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/7f94fe97ced023633370d512676b5bcc/tefil.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/bunorupawozotelovo.pdfIn PDF document text
    • http://deforma.it/userfiles/files/lezezelagebepan.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/15076269569.pdfIn PDF document text
    • https://aiwatopup.com/ckfinder/userfiles/files/67077346962.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/363866d6f6c5596aae46ccea65603eff/54236594910.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/rimapoginano.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/5b0e6163bf30548136af00aef160960b/68315261336.pdfIn PDF document text
    • https://035620126.tw/upload/greenkitchen/files/duwolapegig.pdfIn PDF document text
    • https://satybharat.com/ci/userfiles/files/muvivabolagalunebibos.pdfIn PDF document text
    • http://kezmosas.hu/files/file/54138060006.pdfIn PDF document text
    • http://konberdbio.com/upload/files/439329188.pdfIn PDF document text
    • http://minipit.com/data/files/xajizu.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/t4cpo1vvau0gp4un0tff96ai45/bagixixujagoruzexukodara.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/kitofefovosibixilewel.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/wagajusoxapojewibupur.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/11942603776.pdfIn PDF document text
    • http://k3projekt.pl/uploads/userfiles/files/97270766241.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=best+android+system+for+pcPDF 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_off0000f78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 18576 bytes
SHA-256: 2cce43e76997172d91006bb4156ee2aa562def34c318f403ac64dbd82032ea4d
font_02_sfnt_off0001409c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1409C 10900 bytes
SHA-256: 530f4ac43f799e6a6d5cbd0fdcee3e4a6419793daa2ad5f53e5beaefa5ff469e

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