PDF malware analysis — malicious · bcdea620379619a0

MALICIOUS

PDF

72.7 KB Created: 2021-09-04 18:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 8d9bc536c7f666502ea2051cfa781a4b SHA-1: d5ac2cf1ac894e3afc3657683a336084e04f51eb SHA-256: bcdea620379619a0a9ad653a1b0a3f34fd870b13eb25cb5e46655ca7a0a74bd4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no further context on the specific lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9975

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 http://ventensis.lt/public/ckfinder/userfiles/files/bakotoruzoditafe.pdf In PDF document text
- http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee4661de2f0---83470459954.pdfIn PDF document text
- http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161074d6bc16f6---75058359790.pdfIn PDF document text
- https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/12aff96c97fc7b14c54dca0fc22806a6/69311489664.pdfIn PDF document text
- http://asbufestival.com/uploads/FCK_files/file/motakefemezitunod.pdfIn PDF document text
- http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083344bb0e95---xexetijirubelowubivax.pdfIn PDF document text
- http://autodilykanka.cz/cmsimple/images/file/fedubibofarakibede.pdfIn PDF document text
- https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa1ac3b6e89---bolusoradejorukugenozos.pdfIn PDF document text
- http://lagrupacio.cat/file/48965491562.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076271651470---digetipup.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d1a28314---koladepojomapamijexos.pdfIn PDF document text
- http://xn--2-140-swe8h.xn--p1ai/files/lagulamajozo.pdfIn PDF document text
- http://timnhanhonline.com/upload/files/fufafulawe.pdfIn PDF document text
- https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/3712fa6a915cdbf0f71bab9cca8509f3/fapamowerowumudimopokix.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126af3ea7a4e---mamedegapogedubafotefom.pdfIn PDF document text
- http://whs1979.net/clients/65916/File/29358614679.pdfIn PDF document text
- https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32a3332ff4---77650918491.pdfIn PDF document text
- https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160823668915ec---81887103349.pdfIn PDF document text
- http://aktifithalat.com/resimlerfiles/puzisomop.pdfIn PDF document text
- http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608265b176ef0---vogogujiw.pdfIn PDF document text
- https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/69052948212.pdfIn PDF document text
- http://tz5168.com/uploadfile/image/2021/07/23/file/20210723_144542_135.pdfIn PDF document text
- https://synersys.fr/contenu/file/58694894169.pdfIn PDF document text
- http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/bfg1l97k4f5ps672mtbkd3b8b5/43962728846.pdfIn PDF document text
- https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=maxi+cosi+rodi+xp+instruction+manualPDF 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_off0000b787.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB787	17596 bytes
SHA-256: `18ac45a333f13082123d01f05a2356224811f91a6fbab7ee0d619d2832a462f3`
`font_01_sfnt_off0000e433.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE433	10736 bytes
SHA-256: `9793c7a4dd38c8877151d9d28e7755892479289f381a8e670aeffbada57e7a9d`
`font_02_sfnt_off0000fce5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFCE5	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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