Malicious PDF — malware analysis report

Static analysis result for SHA-256 274d839dad8c594e…

MALICIOUS

PDF

70.4 KB Created: 2021-09-21 20:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4b92dfe8e3c3f3498625cb1a04a5b17 SHA-1: 32d76f070b4376fc1024d5a0e42b498607fa9a82 SHA-256: 274d839dad8c594ea2eeb52cf64d5461b6eff945e820b4569da12d92f88e9a18
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing. ClamAV detection and ML classification strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=android+reset+phone+to+factory+defaults PDF link annotation
    • http://thelifelesson.net/home/tappingchanges/public_html/dowalumniusa/ckfinder/userfiles/files/89017220372.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/5b087277671484ba53f45cd953a1e387/33054475142.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/17694036530.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/roxasexilawuwer.pdfIn PDF document text
    • http://fiumaradelsossio.it/userfiles/files/23999936161.pdfIn PDF document text
    • https://bywuf.org/upload/editor/files/89160746933.pdfIn PDF document text
    • https://congchunghadong.com/uploads/files/91432011397.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/pekitutipawepido.pdfIn PDF document text
    • http://tottazo.com/userfiles/file/82339641253.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/jaxapejuwesisesilovuvur.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/54294879541.pdfIn PDF document text
    • https://clove7.com/userfiles/file/bomoporirofabezasivep.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/80645995446.pdfIn PDF document text
    • http://www.bluefashion.cz/ckfinder/userfiles/files/76538954351.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142ebdbce000---jimexaresotefowikevololor.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/ronurominaxuvat.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f155ba9533---5683519289.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/majalow.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/83346843182.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/74331785955.pdfIn PDF document text
    • http://willbramephotography.com/43162231403.pdfIn PDF document text
    • http://stapper.de/sites/default/files/userfilesfile/gifibinakimutijage.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/60115586752.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_off0000b477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB477 15088 bytes
SHA-256: 7b6c585d5215cee13e7121190117616e3b2859abf5793364d8035794444fd798
font_01_sfnt_off0000dab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB4 10912 bytes
SHA-256: 25df24808cad280683c852d08218b63778aa43fe27448266a7d8d8957b850551
font_02_sfnt_off0000f3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.