PDF malware analysis — malicious · a244b1a1cdd790bb

MALICIOUS

PDF

81.1 KB Created: 2021-08-13 12:02:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: a0d8826e90eec7f35f795f1fd3550c87 SHA-1: 99a76803cd8a67628f9eec4510c332847ac622cf SHA-256: a244b1a1cdd790bbcbbd4a36af2371b8cc0a1be2cdc1a25f4cb6db4b8006d935

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Several heuristics point to the file being a link farm hosted on compromised or disposable domains, designed to redirect users to malicious content. The presence of embedded URLs and the overall structure suggest it's part of a phishing or malware distribution campaign, likely using a spearphishing attachment vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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 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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdf75a6eac---75678174976.pdf In PDF document text
- https://selispin.com/calisma2/files/uploads/fopexibulifeketuniz.pdfIn PDF document text
- http://kyanite.tv/userfiles/file/23974411605.pdfIn PDF document text
- https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/uboqqk4gpu37tarkampifarmvc/nemol.pdfIn PDF document text
- http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef4572b48e---dodototuzototetopatate.pdfIn PDF document text
- http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d982116e28---nejebavibitikinu.pdfIn PDF document text
- http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1610e3b21c3971---ripabisew.pdfIn PDF document text
- https://svetplus.com/userfiles/files/vekaz.pdfIn PDF document text
- http://emannsltd.com/userfiles/sidaxafogujur.pdfIn PDF document text
- https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a73e13787b8---kezibubifonorugifoxu.pdfIn PDF document text
- http://www.tiande-global.com/ckfinder/userfiles/files/kerinagoguradokasuwik.pdfIn PDF document text
- http://christopherspubandgrille.com/userfiles/files/bupoderigelelefepisuli.pdfIn PDF document text
- http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/15340817612.pdfIn PDF document text
- https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/ab763bc322dcf3415e3dacfd0b00ebea/7495696039.pdfIn PDF document text
- http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a097dcd4ce0---93478691158.pdfIn PDF document text
- http://www.anieliasfx.com/uploads/textareas/file/bixabudoxi.pdfIn PDF document text
- https://fotofidelity.cz/userfiles/file/59739369194.pdfIn PDF document text
- https://leifs-auto.dk/images/file/76803717110.pdfIn PDF document text
- http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/72948498016.pdfIn PDF document text
- http://langmypham.com/luutru/files/4663863320.pdfIn PDF document text
- http://www.gonouvellezelande.com/files/6716720422.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/817577955f9c08fbe7adbda2d1d71448/22871503512.pdfIn PDF document text
- http://tktravel.shop/FileData/ckfinder/files/20210626_F92309B201030201.pdfIn PDF document text
- https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/r8h713c1ie2n9drcvc0mkd8i6s/18701656959.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=blackberry+classic+q20+flash+filePDF 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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d6e2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD6E2	10900 bytes
SHA-256: `baf6b01718b5f5b6e42c771017181de232a3270dbe8b0ebfe3ef3a128c3862aa`
`font_01_sfnt_off0000f050.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF050	17272 bytes
SHA-256: `8a6bf37dac324b8379912644aaeca97bd652fe77dd9f8c4a4e9a2594f4326ec8`
`font_02_sfnt_off00011d87.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11D87	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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