Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0b3449ddd08bc8…

MALICIOUS

PDF

83.9 KB Created: 2021-09-17 21:24:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b0f0245c998f17f03239e78889eafa9 SHA-1: 41065cd9ad4bf7fbfe958940655bd024d854af80 SHA-256: fd0b3449ddd08bc89bc1aa3a8d3ab0576e829b523edc31c3d435423492c3e418
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, some of which are hosted on compromised CMS upload storage. The 'utm_term' parameter in some URLs suggests an attempt to track user interactions, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://crewmak.ru/uplcv?utm_term=naruto+shippuden+ep+500 PDF link annotation
    • https://www.vasutaszeneiskola.hu/ckfinder/userfiles/files/53110818362.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/niwavag.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac0f373d9e---fativokepukamanatiwapox.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb79a21393---potuposozibubazup.pdfIn PDF document text
    • http://www.77ice.com/upload/files/gakufugesibadix.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/42440917077.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/gopetujasujir.pdfIn PDF document text
    • https://havilahbuilders.com/userfiles/file/16373660164.pdfIn PDF document text
    • http://coming-c.com/userfiles/file/23335172910.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/rixilosoza.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614164da47f2f---21329592846.pdfIn PDF document text
    • https://triosms.com/userfiles/file/jepolepemetupuvulunilepuv.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136383fe1f9b---gasumezulovoriwukuserip.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/kunakebudeloz.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e817d4364---lekegifevug.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/67444224813.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/sojitari.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d50ccf1416---xekujurav.pdfIn PDF document text
    • https://maintogelonline2.org/contents/files/5492495622.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/wibowugejolofi.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/c803ca032ea9779e6269a3e9731dc4b6/jexovijolubejadudik.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/tokakonapowiwupimila.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/27258682731.pdfIn PDF document text
    • 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_off0000e16b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16B 10776 bytes
SHA-256: 346fcf0f280bbcbc713580e62ef4e1b1ee4f2a07d1c090657c18faef359a4a0d
font_01_sfnt_off0000fa38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 18436 bytes
SHA-256: 8cc33a22f1090c79e579578d75cdc046052b629baf9fd1c7594b60c67616c276

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