PDF malware analysis — malicious · 85e839785fcfef0c

MALICIOUS

PDF

91.6 KB Created: 2021-07-07 07:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15

MD5: 60fb717b77dd81d126c9e46ee7b3cd92 SHA-1: 6fd7a3305a62433dd17e26b583762bdfa307ccef SHA-256: 85e839785fcfef0c6db804f5b32b06d8a63431fd24b8e1ee216382ae136e6a34

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's likely a phishing or trojan distribution attempt. The document functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, which in turn host more PDF files. This suggests a tactic to manipulate search engine results or distribute further malicious payloads.

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://alihuata.com/userfiles/file/kelozire.pdf In PDF document text
- http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/80233930961.pdfIn PDF document text
- http://iccj.jp/images/uploads/fckeditor/file/87579354535.pdfIn PDF document text
- http://gyobel.itpublic/file/13497725794.pdfIn PDF document text
- http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160db1a66681bb---89604293136.pdfIn PDF document text
- https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/7c3572af03b4c3ab350a9af93fb69556/kepizin.pdfIn PDF document text
- http://emannsltd.com/userfiles/7170928409.pdfIn PDF document text
- http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/rb33ojnlttatemqulrevp98g00/3239315647.pdfIn PDF document text
- http://pc75.net/upfiles/file/1624347126.pdfIn PDF document text
- http://alituncer.com/userfiles/file/93125987689.pdfIn PDF document text
- https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/ffb123fc0b51b744c5f78e3fe4cbee11/19590587110.pdfIn PDF document text
- http://ecogestval.com/userfiles/file/nevefimawuwokefuso.pdfIn PDF document text
- https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/m79i5vni8rquvtfourp55bda4h/buvakobego.pdfIn PDF document text
- http://mamnonlittlesun.com/upload/files/vobisetutofofugugu.pdfIn PDF document text
- https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/140bcb8fdf9864ccce9bbe85598a012b/pofumafaxom.pdfIn PDF document text
- https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/49u5br0ff78kpa7tihg75198fp/54304158228.pdfIn PDF document text
- http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a35f206f18a---lodixurebiwabav.pdfIn PDF document text
- https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160770aa4e0a34---bekiguwijoju.pdfIn PDF document text
- https://clubforeducation.com/FCKeditor/userfiles/file/54737464880.pdfIn PDF document text
- https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/sh9iqu54kvhvm4etdoeuco869j/tanaxukilapevanigosusa.pdfIn PDF document text
- http://esoftland.com/userfiles/file/19895360411.pdfIn PDF document text
- http://sbairs.com/datas/files/xumaminipe.pdfIn PDF document text
- https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/1aca2378a020aedc4cafe9b3e89b8bc3/zusol.pdfIn PDF document text
- http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073b47e6f7d0---regitenapagimupidu.pdfIn PDF document text
- http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/sowiwikevidukulemusupif.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=neet+model+question+papersPDF 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_off0000ec9b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC9B	16944 bytes
SHA-256: `78325ff8d7b8d91b930bc83920c2e2580688cbd3987477fc058983e33b6c4b9d`
`font_01_sfnt_off000118c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x118C0	16284 bytes
SHA-256: `6eb162b33eb88f8db5296bdd2517b8e3d9015a108d8cb0c1e5d83c65b2485e3c`
`font_02_sfnt_off00012e85.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12E85	10776 bytes
SHA-256: `5996a72c73db9d55abf817a7d2cb5f12b20aceb82d71cf5939d1174e6b20463b`
`font_03_sfnt_off0001470a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1470A	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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