Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cb6744f5bfd659…

MALICIOUS

PDF

86.3 KB Created: 2021-07-02 00:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: c40aa551d90b9a68636d0b8ee1c0d0f3 SHA-1: 78ce010f024e9a2090b8664cc476e20a53b0e6e7 SHA-256: 01cb6744f5bfd659c814392bf40689407f18b7e177b26d23e20f9110a67ec0b0
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting a phishing or redirection attempt. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its structure and embedded links designed to lead users to potentially harmful content. The file's purpose appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/35in5g102obscotjsehsemfua0/38992665301.pdf In PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/29go4slkbld1jp3n8k66hq4i2p/51479226987.pdfIn PDF document text
    • http://mamam.by/upload/File/file/kemawurutibep.pdfIn PDF document text
    • https://berbagiangka.com/contents//files/47893352788.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/lewuwo.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/cbe9c9c79b9772bc183219165b542fbe/31523148016.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/483b473d930ee21c48d8cc6b74b1fdf2/pukoj.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c65784a08aa---nefuwuwijaj.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/769c5af616760f663fd0739623ae3f0a/84972153447.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782e229157a.pdfIn PDF document text
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/otge19abbd3p0dd2src0naod3b/25859987598.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/f7749cdaaa4da167ce3e83500ed061d7/83725063914.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991d4e9c288---jutarag.pdfIn PDF document text
    • https://xn--mietkndigungsrecht-best-gpc.de/userfiles/file/wokasi.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/h52akp4pm7drj57l5uq2aklci4/palazifibo.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/xogenegu.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/in51ot734e895vfas085u6ukj6/99738980638.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/34270678179.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/kixaxelimar.pdfIn PDF document text
    • http://musiconthebay.org/clients/2/26/269dd5bc96e197da989a8dccc71442af/File/99696812238.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d360b8eda8a---93823819569.pdfIn PDF document text
    • https://usssecuritate.ro/userfiles/file/50487182945.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/6fu89hcge6k9qu68a993do450u/82314686808.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/xemaxokajute.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=translate+abstract+indonesia+to+englishPDF 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_off0000efad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFAD 10752 bytes
SHA-256: 16545e0af430b57187243dfbbb56866839673d7a573e73262c03927a83dc14e8
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001202f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202F 16860 bytes
SHA-256: 1abd876ceccfdc455c753ab24cab97ec5d2ca72feb1bbc583d7874f4f5b753ba

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