PDF malware analysis — malicious · 797455f27dd24e58

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 05:13:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: 3d5331cd2130f1f6f5818ffc93ae9ce0 SHA-1: bd18ae133f91b1e31748bb22ff056d33b7fffe7d SHA-256: 797455f27dd24e58a240d23e078289e860a733bc86c7470911cd9c68bc4a9d4a

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. These links likely serve to redirect the user to a phishing page or to download a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9982

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://teifsepahan.com/files/file/34686979123.pdf In PDF document text
- https://paklya.su/design/img/upload/file/nusixeti.pdfIn PDF document text
- https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/okkvf52r2k8imkggrg3ibprend/12549824626.pdfIn PDF document text
- http://ngnjl.com/userfiles/files/81005121610.pdfIn PDF document text
- https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/nomikm89q24814g3o183au9r6c/75381304992.pdfIn PDF document text
- http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/papirukojinobubabig.pdfIn PDF document text
- http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082433f45361---4683093804.pdfIn PDF document text
- http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/161198b306a6a2---lemaxixugedogagifojugava.pdfIn PDF document text
- http://attlas.center/userfiles/file/xurefofoveg.pdfIn PDF document text
- http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3c432dc2b---momuxiv.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161075c4f2eb74---tutodisuxa.pdfIn PDF document text
- https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/51cf7633abbc71ae9037262d3fe6c7fa/24203490817.pdfIn PDF document text
- https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/4d0496252f133156b560cfe2b6db0104/lajuwere.pdfIn PDF document text
- http://bogelaipigeon.com/upload/file/83546933848.pdfIn PDF document text
- https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/6f190c1ef394eb5290694142b8293275/67337809896.pdfIn PDF document text
- http://www.greenfield-sustainability.com/images/files/lonivutazenariwegigi.pdfIn PDF document text
- http://borisovhlebprom.by/var/upload/file/zarinegedaxuwotogakazuba.pdfIn PDF document text
- https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/9c9b1135b90e79b19d433086d0f069fe/76786057157.pdfIn PDF document text
- https://computerzone.pk/file/lomemekovuzugonalopime.pdfIn PDF document text
- http://smolensk-bakaleya.ru/userfiles/file/39776329368.pdfIn PDF document text
- http://lonerangerfanclub.com/ckfinder/userfiles/files/81704931197.pdfIn PDF document text
- http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087694bb93e3---65862547236.pdfIn PDF document text
- https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/735078a4a6758abc0758caa18404cd09/38245793793.pdfIn PDF document text
- http://nwatchonline.net/userfiles/file/65350844400.pdfIn PDF document text
- https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/p5e0e5fe4aebt9qab08rjctqhu/55445879538.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=holy+bible+in+kannada+pdfPDF 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_off0000be8d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBE8D	17528 bytes
SHA-256: `cc20762c413663808dced29585417b19da0c4e41eabbe2ac7d58a8d03b7c2e5b`
`font_01_sfnt_off0000ebc6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEBC6	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000103dd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x103DD	10460 bytes
SHA-256: `ef475d7e1d36319084d4a3873e6b2b5f763a5f14b827a9328dec3fca82362024`

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