Malicious PDF — malware analysis report

Static analysis result for SHA-256 303664a920c95d3d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-15 10:31:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03f0f23f1cadfe2d322392087327d9af SHA-1: c2a802be3502658cd91ace5d558ccab7994f8e5b SHA-256: 303664a920c95d3dcd914575ed4503d5cf07480f4c94d01349ecb969b6d0c106
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDFs that often leverage JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eletvital.hu/uploads/files/papemebigoga.pdf
    • http://pogotowienaukowe.com/Upload/file/52769297259.pdf
    • http://cerritos.songhakbbq.com/uploads/files/65857302288.pdf
    • http://onlinetradeshow.ir/uploads/files/logarozaweruj.pdf
    • http://odnoklassniki-files.ru/images/uploads/files/20715960688.pdf
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/127a30e8c4a818020b536a52eff73676/34710679013.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffa779f98d---zupibugapijikudegaku.pdf
    • https://ceiling.holcom.vn/webroot/img/files/39275481564.pdf
    • https://ascii.tn/web/cgi/file/91216018446.pdf
    • https://nezrenpin.com/calisma2/files/uploads/kupifo.pdf
    • https://mkontakt.pl/dat/file/51537739183.pdf
    • http://poultech.net/d/files/wedanepowasimakitas.pdf
    • https://gtnet-engine.com/ckfinder/userfiles/files/67047314306.pdf
    • https://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/3621709125.pdf
    • https://ruta.hu/ckfinder/userfiles/files/vojunamusufu.pdf
    • https://teamcode.net/upload/files/vexikeloruna.pdf
    • https://theptaynam.vn/upload/files/duwinamataw.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/33a133d945f03bd23db0542112936b8e/vemivodev.pdf
    • http://sola-brothers.com/userfiles/file/72517659903.pdf
    • https://atasuorganiktarim.com/upload/ckfinder/files/5339317584.pdf
    • http://gist.adrianlechowicz.pl/userfiles/file/vedusanivezisalafa.pdf
    • https://doctorchina168.com/upload/files/vawuwik.pdf
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/h7fjrqhc4gjf4dpfk7c0os1gn0/5792499610.pdf
    • http://pop-around.com/file_media/file_image/file/29892805542.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=my+phone+keeps+on+shutting+down
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCE 16792 bytes
font_01_sfnt_off0000f3e0.bin
88c511903ead6183239bb43c89859a853f191fe4bc0f8151848e9ac17a189596
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E0 20752 bytes
font_02_sfnt_off00012901.bin
fca147c42b35b5c250de076a1ac41a1e810813ecc02a3d87f60b556168e4843b
pdf-font-stream PDF embedded font (sfnt) at offset 0x12901 10748 bytes