Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb39ee59fbe40c3…

MALICIOUS

PDF

76.7 KB Created: 2021-09-10 20:15:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1904c95fd062dff5af5148d1206f03cb SHA-1: b48ccfc05451b40934a9813d2bae1ef517a0dd1f SHA-256: abb39ee59fbe40c3ece65b62624466a31fb457ec9e412783125f560b31077a01
156 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://konzolstudio.ro/uploaded_files/file/soxuxaxoxejuvazijeko.pdf In PDF document text
    • http://alemotta.com/resources/original/file/simodadafilosaro.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/11268925884.pdfIn PDF document text
    • http://krupongs.com/images/file/kigibosavogonazebeg.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109010454453026.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/n2qn3b5j19jhi7nevorao7flo4/2329312388.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/kisilazo.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161383cfdc16b0---59799005906.pdfIn PDF document text
    • https://hiroyoung.com/data/files/somedivazozinekuzuz.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138a417f3838---72996906753.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///15264561588.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/28872030880.pdfIn PDF document text
    • https://studiovizia.com/webroot/img/content/files/44842612782.pdfIn PDF document text
    • https://cr2tek.com/userfiles/Proj_Name/files/69045967064.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/70191778531.pdfIn PDF document text
    • http://bipaf.org/2009_home/upload/editor/file/segavofeta.pdfIn PDF document text
    • https://himalmanpower.com/ckfinder/userfiles/files/peguwokinanoguwinaxobon.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161396ffacc645---wemojeforekaligupidi.pdfIn PDF document text
    • https://rotitelor.com/contents/files/gibesokujavodebapepape.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/0b6f9d0ec394a613f5e1c4f6be7c6790/titajokulaxokolimigu.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/88795574090.pdfIn PDF document text
    • http://baoveantam.org/upload/files/vafipojawokiwivu.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/65163096753.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/74005700092.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/40232058522.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/rososuvisevi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=convert+m4v+to+wavPDF 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_off0000c9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A8 16920 bytes
SHA-256: 3bb7c8f9f155b473a28d4fe9a0ee6c1a4d436337a0dd77a1b13224fcf5f71644
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10224 bytes
SHA-256: 6846c9188bc352cde83bdcf71093b8b4d9cc01a8527e7cb674eaec3dff8012ea
font_02_sfnt_off00010c8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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