Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb13d83b47d462f6…

MALICIOUS

PDF

84.8 KB Created: 2021-09-17 12:20:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 569f8a83ae537c311cb3c3dafe59d71c SHA-1: 39838270f05efdc6a016c17bdddb5309e38e5d45 SHA-256: fb13d83b47d462f60b9f50575876c48d45ea53236b216a2dde7e47685ba871be
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=how+to+use+layoutinflater+in+android PDF link annotation
    • http://efsanepin.com/calisma2/files/uploads/47685344619.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362e9f6e0f2---jagonarurinaluv.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/1779256619.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/rodepepofedikix.pdfIn PDF document text
    • http://occahomesearch.com/userfiles/files/37046687408.pdfIn PDF document text
    • http://jarosi.hu/files/file/ribup.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/pizowonopazapidonejujegi.pdfIn PDF document text
    • https://sportcity.bg/webroot/img/content/files/lefibinefulalodela.pdfIn PDF document text
    • http://helenhotel.vn/upload/files/kadafopovejusogudamube.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/jepenelokapuboxerulizegov.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/60655171781.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/8058309c3c3af438a59f866d553d9477/rajujobuzixaruti.pdfIn PDF document text
    • http://krallarintavugu.com/upload/file/gakoroselodunutinibolubu.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/i4eul47oqvdl1k97efaii508uo/37388491321.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nirasusi.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/xegoxerezovupana.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/86051651024.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/nejalegevarufaduku.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/bgiib2o8on2tpvloe4adlsfhi9/52719709078.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/49562963398.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/87499198704.pdfIn PDF document text
    • http://liyangah.com/Upload/file/79635044818.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411107f40d3---86395747353.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/gemovivaxeliwoxapejagas.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/wuvosemo.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/gabobolomurifikelenox.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_off0000d1c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C9 16816 bytes
SHA-256: 6daf86046ff4410c950a6110dea174ed63cd6be14d88edd639e025b9a259b867
font_01_sfnt_off0000fdb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB9 17944 bytes
SHA-256: 7f52d7829ad1caaa7579f0d30b0efa201af59e772e97d38929f6c4ab28ab02f1
font_02_sfnt_off00012d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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