PDF malware analysis — malicious · eac8453e98f70402

MALICIOUS

PDF

84.8 KB Created: 2021-09-01 00:51:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 67ebad1ee13911c9178be97cca5f603f SHA-1: 563bd12a8b58e7d600dc71f3247eb18da0c2f3aa SHA-256: eac8453e98f704028b4dbcd2f302a1657e72336fdbc1bd4de98a1cbfe32dfa26

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate the PDF contains a link farm pointing to compromised CMS upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. No scripts were extracted, but the presence of numerous unknown URLs strongly supports a phishing or malware distribution attack pattern.

Machine Learning

Nyx PDF Classifier malicious score 0.9978

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://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc59030499---84983368528.pdf In PDF document text
- http://backupcenters.com/userfiles/file/37292291193.pdfIn PDF document text
- http://painttechvina.com/webroot/img/files/mumurobudazuxol.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/1612db46775f26---xuduzilinajaliwu.pdfIn PDF document text
- https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/34lag31h0ajqvf88sg26409dml/nezokarasologa.pdfIn PDF document text
- http://drive4smilesquebec.ca/clients/f/f5/f58105ca183540932673f5bf18e62671/File/dupufovuvekafesedeb.pdfIn PDF document text
- https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/c2bfe6fa2ae99852c2865e0bf6596256/39517260844.pdfIn PDF document text
- https://liantoong.com/archive/upload/files/1029724789.pdfIn PDF document text
- http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ff1ab22a---27281635082.pdfIn PDF document text
- https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/40664c09eea1bb5bebcebe2d668176e1/xivoxax.pdfIn PDF document text
- http://grandp.ru/userfiles/file/zirebilabekamupekazori.pdfIn PDF document text
- https://mk-sito.it/uploads/file/xujoxi.pdfIn PDF document text
- http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e8bbc2d1b---gexiloxovekap.pdfIn PDF document text
- https://okinawa4d.com/contents//files/23781607233.pdfIn PDF document text
- https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608633c8e3106---60070556326.pdfIn PDF document text
- http://badischer-kunstverein.de/ckfinder/userfiles/files/zarevojaku.pdfIn PDF document text
- http://saintthomasmonrovia.org/clients/a/a7/a774d5b45fc75aba9c6fcf07501e1e58/File/giwijofiri.pdfIn PDF document text
- http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083827431516---nadegikowiferizevekuke.pdfIn PDF document text
- https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ha27eo3ph4g9dhtls8ikijlt7r/11570433134.pdfIn PDF document text
- http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094265a1f797---gogadepor.pdfIn PDF document text
- https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/492cc67a63540c254f0ae87937a62802/57210242604.pdfIn PDF document text
- https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/cb92ecb2826ba11cd5ee415452712331/12084382779.pdfIn PDF document text
- https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/6debefeeab8ae848f7cadc3f6d7295b0/16450647462.pdfIn PDF document text
- https://hinaweb.com/upload/file/novawaw.pdfIn PDF document text
- https://glbtrader.com/userfiles/file/99676182378.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=best+way+to+memorize+a+monologuePDF 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_off0000e538.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE538	10864 bytes
SHA-256: `a4115a3c1d6873d247b0525bc2f77a3612a1214e172b93b7c1e9e303f01b8800`
`font_01_sfnt_off0000fe7e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFE7E	17704 bytes
SHA-256: `35b73b5d3d23fe279b53cfaebb90d96a55e0c8419133047d7e4426538b8d5e69`
`font_02_sfnt_off00012c25.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12C25	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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