Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b7d981987cc087…

MALICIOUS

PDF

83.7 KB Created: 2021-07-03 01:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7246ea5990949e39755da81b0243b64e SHA-1: 899112c6320b323227718e81921b6336cc0a9710 SHA-256: 53b7d981987cc087e5ca7a1ed09227f59d5625f190b874aaa4e07ce2e4f6f88b
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for distributing further payloads or conducting phishing attacks. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://smidgel.ru/uplcv?utm_term=solution+book+of+linear+algebra PDF link annotation
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/862d4c1v4akrfp3dgprtc3lkht/dekajobokanosiko.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608240ec61c4f---29992569072.pdfIn PDF document text
    • http://classtool.info/upload/files/wavilevon.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/pepepibitapu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c09d9de07f3---99450414679.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/fb570832b596b7294fac63f097ba6fec/gamokububokema.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/bosinekodugewagazafon.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/hr3hbca9no798jnuet0q359boq/nokasijafanoxiwedige.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/ev1b1s70v6n23q0p76n9d5a5qi/vipufo.pdfIn PDF document text
    • https://tidurmalam.com/contents//files/delenejitevi.pdfIn PDF document text
    • http://haiphongcontest.com/images/files/94024445706.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce2f81ccf5---79661375787.pdfIn PDF document text
    • http://akicgiyim.com/userfiles/file/lirini.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/7p3n2qsvv3shfd5rhc47g3e3q1/rekelizopogovozo.pdfIn PDF document text
    • https://yalcinplayer.com/calisma2/files/uploads/23451220934.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/bd59fdabc7b3656426fb758ad082035c/tudemasisesoj.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/68921667363.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/19517719540.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a01e3f0499---fipuwos.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/94548685560.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/20888588713.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/81335481104.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ec0647a1d---dowetazuko.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/noh032sipdnu2dsr0nb76f59ss/mixire.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/29164148759.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090305bd7352---zabadibazutu.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_off0000e4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF0 10628 bytes
SHA-256: 9db8653a07c698ac9374155e78ac23da9064f9ae0e9648b9d0c675dd29120460
font_02_sfnt_off00011566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11566 16520 bytes
SHA-256: d7a89d63e3c047edbbdf302d867bc0d595ab557d9b1c758f540d6e810920c4c4

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