Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0b9960a5d4ad481…

MALICIOUS

PDF

78.6 KB Created: 2021-09-05 00:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 18541a4eb264a9556109a752aac7215c SHA-1: 476f6b0d5a032a279d4334a3c007cd3e513584b7 SHA-256: c0b9960a5d4ad4816b7ff696866e99c17ece1bc8383908e2803830cc44869eaf
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or conduct phishing. The presence of multiple external URIs and link farm heuristics strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/9duf39sbei6l6felrjbm7eskm6/vudejolopesasabufunaraxud.pdf In PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608491a776cc2---furojazezesegejilalabuw.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a54602ba0---12368084343.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/cb38a9184c1aa0ed900027e611730dcd/14683651215.pdfIn PDF document text
    • http://better-pharma.com/images/file/files/63855621157.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/23591864893.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/32841565821.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1612558db5a88d---35223522782.pdfIn PDF document text
    • https://rm-parketi.si/uploads/jebitalifamibipos.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/wapinejaxozujiberaxasawe.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/02a2579463e8deccc14e336af73074ad/34623221770.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/nimsnr2mdvmk8ve6obitsqve80/63852133274.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/gaforixupoxitararikafamu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/c525ba3f13a4f10984ebd7f72603aaa5/xebakotapobew.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/tuwumo.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6e679553---80605056238.pdfIn PDF document text
    • http://rymwid-training.com/userfiles/file/maxinap.pdfIn PDF document text
    • https://phr4u.com/files/28754064291.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081620d6b25b---waxopuzanegiguritonerawo.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/77086618499.pdfIn PDF document text
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/fdb9f489aeca187adb3c830d45275abf/19497915211.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/63270833865.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=random+sampling+formula+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_off0000cfd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD5 10756 bytes
SHA-256: 27ea764b780fa1d15271eb15499999c04171ea37645c4f8b9d0f2bbba6eb1fb7
font_01_sfnt_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 17220 bytes
SHA-256: dddff52ced14232f1a86fd6a2242a7ad26e76682a800698f01982267d8b1893e
font_02_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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