Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4944c9b434934a5…

MALICIOUS

PDF

89.4 KB Created: 2021-09-20 02:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 459391cb5c3e8b59be1745d40ba8f2a5 SHA-1: e0106796bbea70c45f44d86a14d6f2e659e80b74 SHA-256: e4944c9b434934a5f6356e3bae25822f4bb4daaeca81886ef8d87d5706f97948
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to various domains, many of which are hosted on compromised CMS uploads or disposable hosting. These links likely lead to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://breakevenpoint.pl/uploads/editor/file/29428621476.pdf In PDF document text
    • http://lasantitosrestaurant.com/userfiles/file/wuzatotoxivemavifovidot.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135cad33775d---bebirewenevekekejakoxakow.pdfIn PDF document text
    • http://teakdeck.pl/files/file/midozokureda.pdfIn PDF document text
    • https://sukienmiennam.com/userupload/files/pikepaxexugatijalikuvod.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/jarutapafegavudojonuvox.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/34777867306.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/23937584833.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/3dc8dea9257cf273421a3d61c57538f0/26941933687.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/8af7dc4b5c25885811215650f5b6a44e/gezugawi.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/vedorebusesazobopigaxu.pdfIn PDF document text
    • http://sdes.in/uploads/99148595608.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/37326972070.pdfIn PDF document text
    • https://anfauglir.com/images/file/63502374144.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/9f51bef5ff7145b947a7a647cebca035/mekaminuwujaja.pdfIn PDF document text
    • http://jljemc.com/upload/files/xuvojalugekalawawe.pdfIn PDF document text
    • https://tumujerrusa.com/userfiles/soturomasisatu.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/gufaxakanigewo.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/90231048206.pdfIn PDF document text
    • https://jin-hung.com/userfiles/file/54370456218.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/56330275745.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/12346957152.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/jedubamabimosagogika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=home+workout+mod+apkPDF 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_off0000fa2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 10412 bytes
SHA-256: 598fac7cc272c97995db6df8e141fee0161ada10e61da15770a5ff62a1fc9cfd
font_01_sfnt_off000111cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129E1 18032 bytes
SHA-256: 8496bea15eafc16b66790e75f300c7f9e2eb5a6aa713c06b4c5630ada50cd892