Malicious PDF — malware analysis report

Static analysis result for SHA-256 06157735430696f8…

MALICIOUS

PDF

84.1 KB Created: 2021-09-05 18:34:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: f8b2d9e5f6a2386971ea91726753a86e SHA-1: 6b6b40572186ac485e8b519e6a0e0b895ffc90cd SHA-256: 06157735430696f8a20df5c9ea513de5ebaff9c81ae96e145f08cfc014c6dad4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and it contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The PDF structure and heuristic firings suggest it is designed to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external links indicates a primary function of directing users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kubablimel.pl/Image/files/betur.pdf In PDF document text
    • http://skpizzasubs.com/uploads/files/67181393685.pdfIn PDF document text
    • http://jainfarms.com/uploads/66452105793.pdfIn PDF document text
    • http://keralastatetailorsassociation.com/userfiles/file/9663590076.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160813bdc4391c---71299798797.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160abcee7ad0ce---54251524261.pdfIn PDF document text
    • http://csc-020.com/userfiles/file/20210804100846_gzvrc5.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/miwoxotominixevameti.pdfIn PDF document text
    • http://ambulatorioveterinarioscapindandrea.it/userfiles/files/26703761293.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/mudumoxutedo.pdfIn PDF document text
    • http://xn----8sbaqfskngn1qi.xn--p1ai/userfiles/file/96446587706.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/69485715175.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/vusulef.pdfIn PDF document text
    • https://jnvhardoi.org/ckfinder/userfiles/files/jaber.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/12893355657.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/i8jombtqda7nhtveuombhd7192/duvuwuliwav.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/27063829157.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adb73bd4787---66961457546.pdfIn PDF document text
    • http://izdepskifamily.com/clients/1/1a/1adacdf247316bc4617b3617d965acc7/File/nominibezorediso.pdfIn PDF document text
    • http://axwelindia.com/uploads/5588205902.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/18939925922.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/21d592b20c7931adfd2fca3687a391a0/36763731659.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608707e43c729---sulumenamaxigesadapav.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/17049294703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=fce+practice+test+2017+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 10664 bytes
SHA-256: e3919b42c42b8c2558562fc6c0d5165c2029316810fa78257bac7930a7d81799
font_01_sfnt_off0000fc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1E 17808 bytes
SHA-256: 7bc109a8c9e40db43857eca1a7a0825f4b8a162509db3fc64445f63c10371f4f
font_02_sfnt_off00012ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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