Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ab2e94ea481dabc…

MALICIOUS

PDF

126.6 KB Created: 2021-09-05 16:13:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ccb8acf18ee5fa3300aa820a82069aeb SHA-1: 284d325e19b714890dae0723d97363d5493e6c1d SHA-256: 6ab2e94ea481dabc8078e7de5b26078ecac607021b6739f79067974b63277873
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The PDF structure itself is also noted as having duplicate object bodies, which can sometimes be used for obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://tgtech-auto.com/userfiles/file/gegab.pdf In PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jonefep.pdfIn PDF document text
    • http://casaalu.com/luutru/files/21450073186.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/81521488fba7ef6c4bd0e0cfca85c7f3/jabixukapevax.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/38012443434.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/lujojipepidazulajuvirexi.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/jitb65b2u6fnp2hpcdn91gqap3/65328546804.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/43599324170.pdfIn PDF document text
    • https://csodamalom.hu/files/files/82752060326.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/ropubi.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/81465923451.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/8193139262.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/vumafuse.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/39bfcff8376b02cc0fa96aa192f59cf6/zetonovuxipuxas.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/79096912035.pdfIn PDF document text
    • https://fototipia.hu/files/files/palorozozuxawo.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/vipotopumefogafazo.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/51627902250.pdfIn PDF document text
    • http://taitung-house.com/CKEdit/upload/files/98629720546.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161323b29b5dff---64499912481.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/09b4e439bf4e9a090286256cc3620b3f/37595228863.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16093fe8f5c24c---kigenolizumapotuwudijufe.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ecc8dae9---76178139633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=yamaha+psr+450+manualPDF 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_off00018580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18580 10492 bytes
SHA-256: aa979dc5c38192ac86a7cf29f6d1eb8308051080af66abc0a922b6cb22079bde
font_01_sfnt_off00019d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001b541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B541 21604 bytes
SHA-256: cca5fa39007d44d85b06fa68df53338172e8d69173f419b7268dc1d340dd7f61

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