Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1bb23279b9aada0…

MALICIOUS

PDF

91.0 KB Created: 2021-08-03 23:28:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9e8be80b1c6db1c6d47652c8cf5892a5 SHA-1: ff3591a031afbffef9a127a302929aaa1b4cc8f6 SHA-256: b1bb23279b9aada07802507f119ecbf0ee4ec9f3734a05a67bea5485ef3d12ea
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://dentalcenterstudio.it/userfiles/files/fagedarosiguw.pdf In PDF document text
    • http://taiwan-casters.com/userfiles/file/dunasarizuzatisunug.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/23969081651.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/6716d4e8d5f250fef702e726c21405aa/31256339302.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/kemiwozibevizipenulevep.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1625212222.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbf162497c---48327875716.pdfIn PDF document text
    • https://sukhayurveda.in/userfiles/file/kotizitewalivojusogo.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160920e872ca0f---1721170426.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a89f4028e78---45866921358.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/99ab171d78f147fbfbf14445b8dce1f7/nubekikerozamijoxoxono.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160840d4fa84ca---98284501137.pdfIn PDF document text
    • http://developmentassociationofnagaland.org/nbloom/fckuploads/file/11138106708.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c46f4f7574d1f787bb897ac4901bcc71/koxoxolitijozazijumomaxab.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0321bb5c0---1179925809.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/7ts33s1mgkqcenojpujqa4f75e/97749274370.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210509104936_969996332.pdfIn PDF document text
    • http://learningkey.org/userfiles/mipesetogipejozatojupejup.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/29195171586.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/silinemelimagovax.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/1290636779.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/50269a4e894a136eb5385a020eb15973/73135499051.pdfIn PDF document text
    • http://francescasciortino.it/userfiles/files/50287024922.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/11402873945.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/walobigimenexuwubinufejon.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160751f14e7013---70283771212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+to+change+time+on+g+shock+20+barPDF 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_off00010027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10027 16832 bytes
SHA-256: 97a9877b841600e82292a22af8b915d22209227f47587622ba7037a09baffa66
font_01_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 11184 bytes
SHA-256: 35c625014ad15375f67f54dc52353ca37ec9ba288963321eb370795c99f5fa29
font_02_sfnt_off000145e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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