Malicious PDF — malware analysis report

Static analysis result for SHA-256 bba328aa7c26a772…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 09:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1e877858920a9279319a73ee1e2ec90 SHA-1: 13836434e983fd0ba36f39f9e1d57299c6ea5c3c SHA-256: bba328aa7c26a7728e9ede9c290901f1bd89a1ee3d43ded20443dc77d918e35b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links reinforces the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=shadow+fight+2+special+edition+level+max PDF link annotation
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/fef936a54b16dedbd81ab4a770ce9e73/wefebotigi.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/zunave.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/6e11ba7c9d66daa275f560124e10e608/fugejexum.pdfIn PDF document text
    • https://pepsima.biz/files/file/54563164674.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/vunegixe.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/gufulisuzozivutenuvi.pdfIn PDF document text
    • https://lrsinc.co/userfiles/file/jewojasavasitigupurekin.pdfIn PDF document text
    • https://pratham.one/file/88037805426.pdfIn PDF document text
    • http://bk-plus.at/userfiles/files/mowedebinusofurusuf.pdfIn PDF document text
    • http://yuha.be/_files/file/40771696503.pdfIn PDF document text
    • http://kvrhousing.com/uploads/30170819937.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ae0d14d148605433d40502b002a79e6d/45113123240.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/27083389708.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/4281270063.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/pisuwedirupiwizep.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/lifedafabavijamed.pdfIn PDF document text
    • http://kyochonbuenapark.iorderfoods.com/uploads/files/minew.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/gononip.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/sedavajamojuwa.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/60419351800.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/7crjdfougn9q82j0laqfp1te5t/85585159540.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/66414512425.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613672ce862ee---mobefinoru.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_off0000d522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD522 19576 bytes
SHA-256: d28b4d761e612fb1ae6ea40567230f4bd2f917499456b5b387ad8287012d27c5
font_01_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 11416 bytes
SHA-256: ee4a51a1e480570c13bb8264b9852c8562f66c4c594956460b7571764ddb090f
font_02_sfnt_off00012299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1