Malicious PDF — malware analysis report

Static analysis result for SHA-256 e775379740b4a972…

MALICIOUS

PDF

91.3 KB Created: 2021-08-16 10:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 442e4501560371669a142bf745c94942 SHA-1: 081d5aeaad1762e1af7373b78d12e1ced09a53df SHA-256: e775379740b4a972fc98adaae1ba2a3f698919acd121d315b6ae3ea536329b33
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on multiple domains, some of which appear to be compromised CMS installations. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9907

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/redusubuxozadexogojex.pdf In PDF document text
    • http://niezapominajkowo.eu/userfiles/file/87651175090.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/dogabov.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/detukaridekelagob.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3330466b3---lofotosafadon.pdfIn PDF document text
    • http://mesterek.net/tmp/tunari.pdfIn PDF document text
    • http://retroldn.com/userfiles/file/81674450423.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15410596585.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/4uj3cvatp4hnrt3sps4a4a13q1/pezolubabaf.pdfIn PDF document text
    • https://krossi.ru/images/content/files/5769284659.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/nigu0osfv70fetqpbjns71b2u5/1169925980.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b2cb895934bacbee37c30d7ab38ebb2d/20158554284.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/a6476e1582cee2742feed89d363e2bb5/garalif.pdfIn PDF document text
    • http://bclgrouptt.com/userfiles/file/maruj.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/57182144873.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/ov0c6q1g2qeqkam4udt93s2fkh/82304637024.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/36615682701.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/5a6a840c8653194badbb6e4ab3e39fb0/wojakefaxofowuvorukekiza.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/94396700971.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe391a51351---novajewasewiziferi.pdfIn PDF document text
    • http://mlkscholarshipsmilwaukee.org/clients/f/f0/f021f13c5c598389be7e913a1ae626ff/File/22371925958.pdfIn PDF document text
    • https://maisonforville.be/documents/file/37834507149.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/65027065672.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/82039055090.pdfIn PDF document text
    • http://garderoba.sk/images/_file/36092495838.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f14597759---muratotanu.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/51849724708.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=formulario+para+ingreso+a+bachillerato+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e67c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67C 17536 bytes
SHA-256: 17dabdffb8562b58a4f0fd52954b0c3d9cf728e7b6a046f1d518f37150684d9f
font_01_sfnt_off000112eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112EB 11284 bytes
SHA-256: 2719e1a3f9c3dd4eb3dfdb5f058a67e9114252d7447137b999bceb1eef3ae536
font_02_sfnt_off00012cbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBF 16616 bytes
SHA-256: 06f1d5f5a9083a80364da0885936c8ddb2848b41a67694407b5e75bff462a068
font_03_sfnt_off00014406.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14406 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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