Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb9a2cd040006880…

MALICIOUS

PDF

75.7 KB Created: 2021-09-21 16:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2189cc20f04a8eb8b272d03f79602f9 SHA-1: b44e51275d5085a47711465d21a44d03ea70d0b6 SHA-256: fb9a2cd04000688052a5c48f4f2e697a5089417d81aebc309ee06ca7d9bfa9e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or malware distribution attempt. It functions as a link farm, with numerous external URLs pointing to potentially compromised websites or malicious content. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=the+operating+system+is+an+example+of+a+computer PDF link annotation
    • http://goodfortune.hk/UpLoadFile/file///vulid.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/1035068636.pdfIn PDF document text
    • http://xfswchem.com/upload/files/85833250791.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/segorilulemizidudovurewe.pdfIn PDF document text
    • https://mi-stores.com/basketballtotaal/images/editor/file/41084440936.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/25773600116.pdfIn PDF document text
    • http://rooptex.com/uploads/silopiju.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/mevotititalaxemajo.pdfIn PDF document text
    • https://xn--fiqa735be48e.com/upload/files/reguxilovubebigasokax.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/jedodaxaxomumoradumu.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/65114215146.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/zogubapetosofajom.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133e6b5f17a7---jotaz.pdfIn PDF document text
    • http://woodlandhills.ilovepokebar.com/uploads/files/8127726918.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/matenarekogebinolawadan.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210920_024936.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/85716907511.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/95997176280.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/jetej.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/74393651736.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138a31fd6775---80791542945.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/15310069470.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/97587772938.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/maboravija.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401768cc7b5---rabarifuwejofagivinu.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_off0000c4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEF 11204 bytes
SHA-256: 8f00e3a55787c6d8ee90af28f211b6848074b75fb9888ddea7d56342a3170d53
font_02_sfnt_off0000f70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70D 16392 bytes
SHA-256: 2508c4ea43c0578c2180843b43d665b297306446c880eba60d8b120e49964fee

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