PDF malware analysis — malicious · 1822807d19ce3e41

MALICIOUS

PDF

90.7 KB Created: 2021-09-07 16:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17

MD5: d65943590d96a9b8906235a163003052 SHA-1: d4887fa921eb64953be514b0343190bd38a0a52d SHA-256: 1822807d19ce3e41b1c0f972758ee36cfb38cb89c85ad6148ff6c4df9536391c

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9765

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://nhatminhtrading.vn/app/webroot/uploads/files/batoderifuwud.pdf In PDF document text
- http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c969686cc2---65948554209.pdfIn PDF document text
- https://andrejc.si/files/file/84981843343.pdfIn PDF document text
- http://perles-del-beya.com/userfiles/file/88616613841.pdfIn PDF document text
- https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160810ed041638---betodusojoxamag.pdfIn PDF document text
- https://mashura.co/userfiles/files/68011713167.pdfIn PDF document text
- http://indago-rovigo.it/userfiles/files/zuziposagowetijerej.pdfIn PDF document text
- https://mclandpin.com/calisma2/files/uploads/42309493887.pdfIn PDF document text
- https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/9emntnq385m5tbc500khlicq3f/17818051148.pdfIn PDF document text
- http://portaldeaquidauana.com.br/ckfinder/userfiles/files/28412719624.pdfIn PDF document text
- http://csc-vietnam.vn/uploads/userfiles/file/nimilovu.pdfIn PDF document text
- http://all-premium.com/user_file/files/92369201054.pdfIn PDF document text
- http://dailymaydemtien.com/userfiles/files/58009474839.pdfIn PDF document text
- http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609994bdc87ec---fivuzokenivozipabov.pdfIn PDF document text
- https://resonanceacteurs.nl/userfiles/file/xapizopotu.pdfIn PDF document text
- http://sunil.kr/uploadfile/fckeditor/file/folulujori.pdfIn PDF document text
- https://slezanie.eu/userfiles/file/wapeguvavemoxepifazarudiz.pdfIn PDF document text
- http://hongdanhaudio.com/luutru/files/rigunexidopoguniwupurebu.pdfIn PDF document text
- http://shuswapladystriders.ca/userfiles/file/76427534590.pdfIn PDF document text
- https://daks-96.com/f/uploads/files/fifaju.pdfIn PDF document text
- http://gokea.org/upload/editor/files/13638266679.pdfIn PDF document text
- http://htwy.com/upload/file/58509703364.pdfIn PDF document text
- http://www.startservis.sk/novy/ckfinder/userfiles/files/dexezowazevij.pdfIn PDF document text
- http://darec.sk/files/files/16076656882.pdfIn PDF document text
- https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b1b3460bf6---62106976755.pdfIn PDF document text
- https://bustotoronto.com/userfiles/file/32692432505.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=delfin+pdf+deutschPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000d9be.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD9BE	23680 bytes
SHA-256: `6d911d6f1b12780d489f7ccf7afd1f54e8c3c33e00426280354c6ff056bdeb19`
`font_01_sfnt_off000115d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x115D9	10436 bytes
SHA-256: `b1c3521873848ba89be6fdd057132db643b7d5b1491d1db55e3f6dbc95b81528`
`font_02_sfnt_off00012d67.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D67	16544 bytes
SHA-256: `c30f8713f6ca4e0d9ab85ecdf63b90f5f022fb769ef983a2ca4f5d073be1b449`
`font_03_sfnt_off00014483.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14483	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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