Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fa43bc16f9fbfc4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-08 05:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3093d04f469ec4d7ed01544019ede12f SHA-1: b17d2a83bec979547f7310492475588e958cde16 SHA-256: 1fa43bc16f9fbfc45a50652ea800ca5f72537402ab0995265cb1307a86de768d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of PDF-specific heuristics like 'PDF_URI_IP_LITERAL' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, pointing towards the exploitation of users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://barudan.hk/UploadFile/file/20210519084356296.pdf In PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/38997135847.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/36407656707.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/48813136850.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/4af048be9b787daac6c2cf4560a0cf21/44728201268.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/161375fb8270f7---58679160243.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bea3b543c5---dimidiw.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105160052.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/rebedokemoravurin.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/kekide.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/d6acf257aedd3776ea009dc0d6418b1f/46369465488.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd6edad75d7---70837431053.pdfPDF link annotation
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3465a73a8---motesigapowawowuligov.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a169fbe8ff2---81888788935.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b060af1adfe---vajinak.pdfIn PDF document text
    • http://xoblates.com/clients/e/e0/e08cfb93fb97b00c28394d0532709dc9/File/53097192326.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ecab0ed593f---36361453576.pdfIn PDF document text
    • http://anpharma.net/upload/files/62603685120.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2cab992ad058c716180af29d2590115c/moxidem.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/87955441391.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c28a3749d8---xawix.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/58765826173.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/14924541625.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/bfaf27451725926cd1923a4183c6dec8/57277526022.pdfIn PDF document text
    • https://leosservices.com/userfiles/file/pikuzakekanukefojutisapaj.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/34596932409.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=agenda+setting+in+public+policy+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_off0000e0a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A0 17944 bytes
SHA-256: 11649d281e0bd086633e2f364132ac8d2c0f26d16d970cc3afbb6eeff228c140
font_01_sfnt_off00010eb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB2 11028 bytes
SHA-256: ecaf5bdb24305c51f7e512c309fa973968922c001337d7ff987b4ab560bf8d05
font_02_sfnt_off0001281c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1281C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1