PDF malware analysis — malicious · c8f26f974ad87383

MALICIOUS

PDF

86.2 KB Created: 2021-09-09 16:01:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07

MD5: 0fbd99ae984ea4df3df3dde1a45c4b71 SHA-1: 899593d76d05f2e8169dfa9136b9bb8c2cdf1bcc SHA-256: c8f26f974ad8738374c7857eccf4ce0cb3af7d58fa6b3f1987aebc79e83de12f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the overall detection indicate a phishing or malware distribution attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=live+football+online PDF link annotation
- http://phanphoiongnhuahoasen.vn/upload/files/54559791534.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ab70d98e9269165332800fbaa9f47179/20868835916.pdfIn PDF document text
- https://femagnet.com/upload/edu/article/file/35752518095.pdfIn PDF document text
- https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/5feccd7af45d876e63252d56141047a3/11377472373.pdfIn PDF document text
- https://www.corpeverest.com/ckfinder/userfiles/files/62012802889.pdfIn PDF document text
- https://xyoaa.org/sites/default/files/files/xitujasutubu.pdfIn PDF document text
- http://microcement.ua/userfiles/file/54696599660.pdfIn PDF document text
- https://arendic.cl/files/kuman.pdfIn PDF document text
- https://davidfoleyinc.com/userfiles/file/76080401599.pdfIn PDF document text
- http://www.hausbaumesse.at/ckfinder/userfiles/files/10010812693.pdfIn PDF document text
- https://songhongresort.com/img/files/59105513245.pdfIn PDF document text
- http://thebeautyofdesign.nl/ckfinder/userfiles/files/bakofoxeganexiligodun.pdfIn PDF document text
- https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/bbdhskr1shbs5h6msflhs0hqh5/gamawofo.pdfIn PDF document text
- http://drtamerturan.com/file/25318423217.pdfIn PDF document text
- http://nepalbestcargo.com/userfiles/file/63740967086.pdfIn PDF document text
- http://smsalumni1971.com/apadmin/uploads/userfiles/files/51840030800.pdfIn PDF document text
- https://transturist.ba/ckeditor/ckfinder/files/files/87596649000.pdfIn PDF document text
- http://alexlunacoach.com/img/editor/file/jazotikajuzirawofirovaxat.pdfIn PDF document text
- https://www.bevillelecomte.com/ckfinder/userfiles/files/nugobebasaboki.pdfIn PDF document text
- http://maternites-catholiques.org/ressource/site-image/files/9899952256.pdfIn PDF document text
- http://kibunajcc.com/ckfinder/userfiles/files/wadatoj.pdfIn PDF document text
- http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/nepovavetijipusitonatuna.pdfIn PDF document text
- https://saikekanglun.com/filespath/files/20210905095251.pdfIn PDF document text
- https://szaniterplaza.hu/ckfinder/userfiles/files/57776721473.pdfIn PDF document text
- https://takipbizde.com/calisma2/files/uploads/65580882626.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_off0000ecfe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xECFE	10100 bytes
SHA-256: `42124b87941fb5a6e6f93ba3aa22ecd7a04a59f0e3ffe7629aa2c0ca7ebe1cc1`
`font_01_sfnt_off000103a2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103A2	18224 bytes
SHA-256: `24ce86cd70bf945f4364d1d45ef23f92676300e2a76d5f470f459b73c6ffa7b5`
`font_02_sfnt_off000132f1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x132F1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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