Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56ed87c2484f3c2…

MALICIOUS

PDF

80.4 KB Created: 2021-08-29 04:04:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 07837a364027ebefa21a0f562bbfd101 SHA-1: ed2b2f150f42fb54680d8ab91df68ddd1e510ad3 SHA-256: f56ed87c2484f3c2c34cba6079545b330c19efdf9c681d140e39fb9a85d5a24a
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal that the document functions as a link farm, containing numerous URLs pointing to external sites. Several of these URLs are hosted on compromised WordPress installations or disposable domains, suggesting an attempt to distribute malicious content or phish users. No scripts were extracted, and the document body was unreadable, but the presence of a link farm on compromised infrastructure is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://www.diplomat2014.ru/ckfinder/userfiles/files/zufugojulomasisi.pdf In PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/43093058640.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/tewujepupebixedobokoti.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/38428494760.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/39103996926.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/37204638d50ac83f758bbdc85a5656ed/22580747894.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/59143b4130d3a7cdb53106583f4a453d/715129365.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/95757945333.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/69041237896.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/8b0a39175066693733e08b2013164b81/budumowowit.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/14313820309.pdfIn PDF document text
    • http://ypcalumni.com/clients/2/24/24042806289e0d450134266962f0a0d8/File/42801324450.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3e0bb3e1eb---xiworupapifumawuturili.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/xugejaxesupap.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2b719eb0ba3b4b23044918145af1f1a9/5505773242.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/debijixakululuk.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/gawufuz.pdfIn PDF document text
    • http://wearefamilypalestine.com/clients/3/3b/3bc38fc23f9ffb54b20226cbd6ad6ce3/File/kudulovu.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/metovidamododadanolosab.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/lizipalozivibibizo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/7d7b4cadbed6bb6f6326a08f27da961c/51654018822.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/64619033216.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/535187308.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/wunatasuvoxudap.pdfIn PDF document text
    • http://rauvuonsach.com/images/uploads/files/tafago.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/95316272470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=long+term+side+effects+of+mononucleosisPDF 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_off0000d726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 16656 bytes
SHA-256: 6e1e782187f4a9dcea024accbe99386161cd6a25fa0167f8477fd3be51c0c16c
font_02_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 10712 bytes
SHA-256: 75657d8e0a3775fae0682c3f81d356f23778c166be3d5038dad4ff68b8f35610

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