PDF malware analysis — malicious · b2f11f6d72d38d1b

MALICIOUS

PDF

78.5 KB Created: 2021-09-01 16:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: e1faffa54db4d76f5710c01386a519d8 SHA-1: 24b20fccf58aeaaaafa50fddccc10425d1dd137d SHA-256: b2f11f6d72d38d1b677cfaef00e8c3d22ad3d6a344c48fe0f0405c5117119dff

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure itself is the attack vector.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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://pistant.ru/uplcv?utm_term=3+methods+of+contraception PDF link annotation
- http://sklepjola.pl/userfiles/file/lamusunuvefulopibemufuxil.pdfIn PDF document text
- http://waelfawzy.com/userfiles/file/72330064194.pdfIn PDF document text
- http://yuanjen.com/ckfinder/userfiles/files/73736909851.pdfIn PDF document text
- http://korea-seals.com/ckfinder/userfiles/files/powodepavari.pdfIn PDF document text
- http://oio.cn/uploadfiles/files/22600856782.pdfIn PDF document text
- http://budka39.ru/files/savuzotumade.pdfIn PDF document text
- https://alusol-kw.com/ckfinder/userfiles/files/tupabaden.pdfIn PDF document text
- https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/rg0v5capreme7jh9ht0ceekpgp/vufevajoduwezuzoju.pdfIn PDF document text
- http://ahkkpcm.org/userfiles/49034782010.pdfIn PDF document text
- https://pacpartner.net/images_client//imagesfile/zabixiziwusezo.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59d410646---34550080490.pdfIn PDF document text
- https://tonitomov.com/picture/file/pukugidovabaxegibor.pdfIn PDF document text
- http://vladjurnalist.ru/archive/file/18243565594.pdfIn PDF document text
- http://taitung-house.com/CKEdit/upload/files/51174509361.pdfIn PDF document text
- https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/476225ec4abb76a6a139bcf57f828074/80227022487.pdfIn PDF document text
- https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/fd2635ee07d2e47d1ead8ba1f488ab16/11778562311.pdfIn PDF document text
- http://domesticsolutionsagency.com/userfiles/file/69954406523.pdfIn PDF document text
- https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/ae3aa6e5b8d28b9369381e395fdb5930/93961202464.pdfIn PDF document text
- https://spheresignal.com/app/webroot/userfiles/files/nufapewog.pdfIn PDF document text
- http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/0a3525a60f7689b8789ea9ca2a97006b/22237920878.pdfIn PDF document text
- http://roocenter.ru/upload/file/43870498899.pdfIn PDF document text
- http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/moxadominikoji.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16100e1fa44c10---navemivejegalo.pdfIn PDF document text
- http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e73251d1---gekutape.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_off0000cdb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCDB3	17712 bytes
SHA-256: `1408d24d1780728dfaeaa031ce2e9455ec8fe15b2719ff3df2f74bd2cacc12dc`
`font_01_sfnt_off0000fb99.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB99	10912 bytes
SHA-256: `5b6ffc577b52ce592cc044194fca065adc8f53ba75de34f89d480d3c8f8ef517`
`font_02_sfnt_off000114a8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x114A8	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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