Malicious PDF — malware analysis report

Static analysis result for SHA-256 100d7f5b1d03eff6…

MALICIOUS

PDF

82.7 KB Created: 2021-09-02 08:00:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 326a803d05ee685b7315e9a83085a75b SHA-1: ab39b04c9173c53d3eaeae2cc2eb64ea47161d3e SHA-256: 100d7f5b1d03eff6d10cc53b0efa29c1fe71a88fd4be7f98a34485e07dc56dad
156 Risk Score

Malware Insights

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

The PDF file contains a link farm directing users to multiple compromised WordPress upload directories, suggesting an attempt to lure victims to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16073c53d0f685---vusixijo.pdf In PDF document text
    • https://menlopark.com/wysiwygfiles/file/mawukibexujabufuja.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/95566971837.pdfIn PDF document text
    • http://djapm.com/userfiles/file/9347906985.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/61045790946.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/29a2a1188260af427bb640da521d46f8/46723855360.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/280800077114.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qe19pp1kaolhf1qaau8cda7b9h/36434150265.pdfIn PDF document text
    • https://olterus.com/contents//files/60561465530.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/fubunugebe.pdfIn PDF document text
    • https://ancoraeducacion.com/images/34349141432.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160ab685b4447b---nodamakinozololupavuv.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/36159139250.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608862edc8745---26277657722.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/61256809406.pdfIn PDF document text
    • https://avela.md/userfiles/file/fabizinerusixarenajag.pdfIn PDF document text
    • http://edgewood1962.com/clients/2/2b/2b25cacec04995aba37d275b9c35b4d1/File/rulamovi.pdfIn PDF document text
    • http://auroraenergyproject.it/userfiles/files/jimerafudapi.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/isdhbg8s1jk8o5dv23v3vj7825/sexafuxonik.pdfIn PDF document text
    • http://banlinhkienlaptop.com/userfiles/file/18537349899.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/padojefal.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/70af6343a53d617b7cd05c746bc1a9a7/26878473838.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b75c981100c---29015605178.pdfIn PDF document text
    • http://henrysadiereunions.com/clients/876463/File/panosuvopiribunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=synonyms+of+creativePDF 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_off0000df0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0F 10708 bytes
SHA-256: 9dc3c9d3e70ed0210cc9e5d001ebbf675db54acfc1ffc13bdbc48ce3ccfcc32b
font_01_sfnt_off0000f7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AB 17464 bytes
SHA-256: b7fe91770e9817cce0acb873dd9200fa30fe0f53b0a323004518eeec961ed5a4
font_02_sfnt_off00012508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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