PDF malware analysis — malicious · 701f1959490f4351

MALICIOUS

PDF

93.5 KB Created: 2021-07-03 07:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 1215338f4958ab04eabad967b997195c SHA-1: dc72078cb56c08fa025d4af6d35af1c07f99a1a0 SHA-256: 701f1959490f43519844ee6b65b3c7e1f62a478342e1f74486c2fb7b11cd7305

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to potentially compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. Although no scripts were explicitly extracted, the nature of the link farm suggests it is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://inwebjor.ru/uplcv?utm_term=oxford+dictionary+of+biology+free+download+pdf PDF link annotation
- http://allaboutdowney.com/userimages/mefasefaxekunorinepib.pdfIn PDF document text
- http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d150b5d909---5098870053.pdfIn PDF document text
- http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/t9h799bv36q9regb3kb9uv0llj/lezobu.pdfIn PDF document text
- http://work4shop.cz/userfiles/file/wubilano.pdfIn PDF document text
- http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b35305ace8f---zutivurur.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/sizukis.pdfIn PDF document text
- http://hzdsbg.com/uploadfile/1621757073.pdfIn PDF document text
- https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/dj1q6b7vs5jg0k8m0beft7lpe7/6110260712.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c4a739050---xilotelusapobefosibutu.pdfIn PDF document text
- http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/56367692324.pdfIn PDF document text
- https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/mmooelfhdmj8ptamq410qk7ls9/57059545426.pdfIn PDF document text
- http://www.findvoters.com/userfiles/file/siluzotijelukipes.pdfIn PDF document text
- http://lohs69.com/clients/82366/File/80274724783.pdfIn PDF document text
- https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ba97b8b2c---xevokuwajaxizemorubid.pdfIn PDF document text
- https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607034f3d5309---zufuwetowujemu.pdfIn PDF document text
- http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16072069c44fa0---xarasabipawevonerujato.pdfIn PDF document text
- https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9c98a5339f671f26978365a1035a9271/xukezusupetimekokos.pdfIn PDF document text
- https://dolaodong.com/userfiles/file/vopitikinob.pdfIn PDF document text
- http://exito-opakowania.pl/userfiles/file/gugalimifin.pdfIn PDF document text
- http://bezpieczna-strefa.pl/wp-content/plugins/super-forms/uploads/php/files/1f0c1375850ce54aea791c61801fefe9/90130742961.pdfIn PDF document text
- https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfd5b06b64---zolujokawokadujotopijojek.pdfIn PDF document text
- http://granitemountainranch.net/userimages/xatufonabebi.pdfIn PDF document text
- https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/2c0cee935bb66444723d57e0fd90f661/nupesejaw.pdfIn PDF document text
- http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/2ca8522c9dd6e8164d4e18eb5a805f19/ligekazedawe.pdfIn PDF document text
- https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa89e485e9---13862552667.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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000f0cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF0CB	11096 bytes
SHA-256: `445cff0ee15e5d985c926f1ab4abddc3b1fb918ae1781978d84bc9785b88588b`
`font_01_sfnt_off00010a76.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10A76	17748 bytes
SHA-256: `2e815ea81c65228646535e93751f0b53660e1d928516be9f0d454b7ac7369046`
`font_02_sfnt_off000138c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x138C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000150da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x150DA	16544 bytes
SHA-256: `66b7945b99a9c78025a9a0ace4161995b24b08b80ea391fd428eddc3553bac27`

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