Malicious PDF — malware analysis report

Static analysis result for SHA-256 843769c81bbef4a4…

MALICIOUS

PDF

122.0 KB Created: 2021-06-28 02:41:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f71aeb570886e6b3dde21e49ba62b58a SHA-1: 8dd69fea426de62b775cae3471d27d8c2fc2ba7c SHA-256: 843769c81bbef4a4f3388cb8006d8466e48bf50e0990822557b63b8902ad9c0e
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs are the primary indicators of compromise, suggesting a redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9d0b9f61c5d52e7c18400ba1d5d25062/1959426850.pdf In PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b04e58dab---wagosolagi.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/wuxukikomur.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/kckjh10j3g5n36uth5tifipdo0/30199688622.pdfIn PDF document text
    • http://pitneyclan.com/clients/c/c7/c7afcfad87c307b096642b2e35f52d25/File/didebewiwumumij.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/3e922337f515cff28eda07ae01656002/12406452333.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/5h9u7de3j9jvrvkoo4s77genl3/fezezolapovifovuz.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ddd732f5e551dc26385f88aac9043903/vesobukivafajominimiz.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/46906660610.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/87994949466.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607487fbc009c---83383408360.pdfIn PDF document text
    • https://laser123.com/geektic/files/99053098766.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/ccd136536fbd95fc6d543a8d91c9bb07/kafanisujafutibef.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/usce0gmt0bo6v6qdrhn8dr4a9a/fivekadifimadigim.pdfIn PDF document text
    • https://bselink.com/userfiles/file/47902171457.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bed7aab47---84792464750.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/ce7a25249790a2175bbbb6e36d413b7f/nilebogelinaxavusexe.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/v7qp3hrqp5cqlogl96ccnuhua5/xerasumipisef.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6028868f6---fakokevagabefebexuguga.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/pexakosuluzizegijobasemu.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1ea526c0ec---dexuge.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/48527286455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=c+pointer+to+pointer+arrayPDF 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_off00017bbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BBF 18336 bytes
SHA-256: beb2443974865f16a27d496d9b838cbe0e804a2d606d858f264fd329d4e7331e
font_01_sfnt_off0001ac05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC05 10176 bytes
SHA-256: cb16ed7b033be16cf35ebff4505757385506a688560dacaaf8f747442e974b4f
font_02_sfnt_off0001c2f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C2F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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