PDF malware analysis — malicious · f55d3d864cbfee99

MALICIOUS

PDF

97.6 KB Created: 2021-08-26 07:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16

MD5: e5ae0b97ad23161fbd54478b09cc6708 SHA-1: 38414d18609c7a13dd6c07fe12fe6fdb9392cc5d SHA-256: f55d3d864cbfee990afd9b169f1bb05416e81a8e4e04b7b72662bff5bedbc551

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was detected 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 WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9888

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 https://oniceh.ru/uplcv?utm_term=substantive+test+for+inventory PDF link annotation
- https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/79ec5d6506f3a56416d0c6ae437a08e9/pixiwir.pdfIn PDF document text
- http://cambresisemploi.fr/ckfinder/userfiles/files/tobedegolegovuxufewaxuri.pdfIn PDF document text
- http://bbbswalkforkids.com/clients/c/cf/cf8d0549bdc9bbdffca8bc0db9808b96/File/13536375236.pdfIn PDF document text
- http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085317270b0e---95710097330.pdfIn PDF document text
- http://www.prunay-en-yvelines.fr/ckfinder/userfiles/files/64936248241.pdfIn PDF document text
- http://szwygs.com/upload/didadamusupig.pdfIn PDF document text
- https://braintreeclinics.com/app/webroot/img/files/69621364163.pdfIn PDF document text
- http://ambulatorioveterinariosantanna.eu/userfiles/files/17479518763.pdfIn PDF document text
- http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad58ed5cd06---81940866694.pdfIn PDF document text
- https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/707e55ac82fab9b1cf786a735c7c8234/88341128705.pdfIn PDF document text
- http://wmc21.com/ckupload/files/rokogaravewige.pdfIn PDF document text
- http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e8bef7d4a6---83457461311.pdfIn PDF document text
- http://yangpupark.com/uploadfile/files/75972584555.pdfIn PDF document text
- http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b865908ad---sofanuguzotevuwowoju.pdfIn PDF document text
- http://historia-bfured.hu/userfiles/file/nutolumimivuravakebonifav.pdfIn PDF document text
- https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d6f65ad876---dememijefinidodedodinigeb.pdfIn PDF document text
- https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a30c237d1ff---33856286921.pdfIn PDF document text
- https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123b0eb6cfa3---31796395788.pdfIn PDF document text
- https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608a08f71abda---suzowogukinixugim.pdfIn PDF document text
- http://avstralianature.ru/ckfinder/userfiles/files/tigekokiripa.pdfIn PDF document text
- http://avtrak.ru/ckfinder/userfiles/files/59591863634.pdfIn PDF document text
- https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/e9b4f962fa844a7be41043add5f86aae/fojogofisojovakeneduf.pdfIn PDF document text
- http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc5e521787c---vadezenasijebe.pdfIn PDF document text
- http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073aadcc0256---22523319458.pdfIn PDF document text
- http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070701a4525d---xemomiseb.pdfIn PDF document text
- http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a47ccf7a0e7---fimumesez.pdfIn PDF document text
- https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/3d7e40b303884501f4d209959a249cf8/varozarevolamiwumixul.pdfIn PDF document text
- 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_off000116c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00012ed7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED7	10656 bytes
SHA-256: `57e6773a54390a4d6af8bba7d95d6574b08c023b58f211991f8b1a2f63e26c3c`
`font_02_sfnt_off0001477a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1477A	18144 bytes
SHA-256: `89e311dc528571f0aa34c000b4b167bcac2a85885164e85445c4c97551cbfb8b`

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