Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d21c72a4708b998…

MALICIOUS

PDF

86.6 KB Created: 2021-06-25 12:50:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 6bdbccbddf9e49d0a4935085fa9ab0e2 SHA-1: d2608ead54d10040dd4e0cced88392b498ec6bc5 SHA-256: 3d21c72a4708b998d91a2756dbe7be8f21e0e458b1028a0550872762d185e236
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/220271e2f691ec33b06334b9af182558/48282876257.pdf In PDF document text
    • http://dekoblickfang.de/userfiles/file/17732171705.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607d66c670c6a---raxafofikizuzazopexuv.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/6ba00776875c73da755ade82d22273c2/zupavuraranajovep.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/u5kepq4higp7u1kl2rdjimghku/tujoruvasipipibivi.pdfIn PDF document text
    • http://xn--2vxr09c6mc.tw/CKEdit/upload/files/vefevexegenez.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/lipofefenetuguvazip.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/sovebinedidusebodijow.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160870cde8168b---26597297118.pdfIn PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/69210520636.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/fagenagakasu.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/52577fa13b0c807f22b0a84e58117f76/29000937836.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/91237737289.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/11137829090.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d15d423831d79c3193a787fe8683872d/dobovedajag.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/30809614a25f969d86e4e72675d0dda8/mobojitanoburakezizusir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=first+touch+soccer+2020+download+apkPDF 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_off0000e102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE102 11108 bytes
SHA-256: 307ff66f00dc69aa4a82ddd3e61554bb3c9e8e1990a3bb4954b045b783210c8c
font_01_sfnt_off0000faf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF8 22764 bytes
SHA-256: c76c8b68055ab4c0c1dfc6e50e25f4b7f3f27c4599235f610271675418324303
font_02_sfnt_off0001335d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1