Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aac390cb065bc07…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 20:12:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9937819d38a1114467c7b1e00db0df61 SHA-1: 487c6ec5450073fd43ffb3cff037612f0a46ce72 SHA-256: 6aac390cb065bc0760733a88b2be3ef778fd8b60a375f3127c65f183ddb8a591
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16138a9852acdd---90959929845.pdf In PDF document text
    • https://satesayap.com/contents/files/fepekadurufokepekug.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161348688ced4a---44251385483.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/50326467043.pdfIn PDF document text
    • http://princeworldwide.com/multimedia/userfiles/file/faxal.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/10004036903.pdfIn PDF document text
    • http://deforma.it/userfiles/files/pitigezomitivixup.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/velosoruberorefarosugito.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/xojesinorogunozanatixel.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nenekulejofepinipawude.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/natiromupapogekemedoguvab.pdfIn PDF document text
    • https://happyfun.tw/uploads/files/202109061207313005.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/77531067277.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/22563262681.pdfIn PDF document text
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/58725768343.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/pijulejiwivurozofo.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2f8adea5a---8183362110.pdfIn PDF document text
    • http://brilsports.ro/userfiles/file///80719507524.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/girudakilag.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/saxavofosinezolidemixibon.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/59853394171.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/munidagoropaxefa.pdfIn PDF document text
    • http://ashioke.com/images/library/File/jexopolalijuxezapixajobik.pdfIn PDF document text
    • http://technimexvn.com/images/ckeditor/files/71229043270.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=can+i+download+app+store+on+androidPDF 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_off0000c7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B1 10500 bytes
SHA-256: ddedc7c6bbce83af02d733a0b98dc16397d233779465d29c6d6b5d62460ccc1f
font_01_sfnt_off0000dfbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBE 18036 bytes
SHA-256: aa154febfdfb004c012577cb529686efea083c04bf0305c4fdf45f87b1419f83
font_02_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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