PDF malware analysis — malicious · 7a896dfee4d79c53

MALICIOUS

PDF

72.8 KB Created: 2021-09-18 08:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16

MD5: ba9b686e66ab7e1de25930775f218f22 SHA-1: 49bd4eb0f7af51130f77dccc4390e890579f3ff6 SHA-256: 7a896dfee4d79c53835a827464d3fa36246c5fdd8118f5d58477ca29ef665ae1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of embedded URLs and the overall structure are consistent with a malicious PDF designed to redirect users to potentially harmful content.

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 https://chcial.ru/uplcv?utm_term=five+nights+at+freddy%27s+2+demo+apk PDF link annotation
- http://china-spec.ru/userfiles/file/13222105012.pdfIn PDF document text
- https://tonthephunglan.vn/upload/files/kaxon.pdfIn PDF document text
- https://lnpro.in/ckfinder/userfiles/files/semelamibefogil.pdfIn PDF document text
- http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/zetekavotevazezaf.pdfIn PDF document text
- https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/4lc237bailas0aok179n7i83ck/60685933440.pdfIn PDF document text
- https://hasekei.jp/userfiles/file/peputabuzexulobimidifiz.pdfIn PDF document text
- https://asesoriagade.com/app/webroot/files/files/70505598711.pdfIn PDF document text
- http://panel2conso.com/userfiles/file/34189582469.pdfIn PDF document text
- http://clinicaveterinariaalbese.eu/userfiles/files/54296694725.pdfIn PDF document text
- http://duszek-lasu.pl/userfiles/file/43318784503.pdfIn PDF document text
- http://pathtojanna.com/userfiles/files/13335855682.pdfIn PDF document text
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8573ba9a9---polusivijuruguroragatiraj.pdfIn PDF document text
- https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/c94795f3685905474afa7ac7baf202fa/62271889812.pdfIn PDF document text
- http://kleinschaden-expert.com/userfiles/file/67596908464.pdfIn PDF document text
- https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3d2487f70edd239a28f6494588478e1a/vekuboxopegofebel.pdfIn PDF document text
- http://facyt.com.ar/ckfinder/userfiles/files/vudipikebawonerixapakufe.pdfIn PDF document text
- https://himalmanpower.com/ckfinder/userfiles/files/zepotavoresu.pdfIn PDF document text
- https://otterdisplay.com/userfiles/file/wularutu.pdfIn PDF document text
- http://studioesflores.pl/obrazy/file/49328467840.pdfIn PDF document text
- http://urgentcarepb.net/userfiles/file/sijatavivexevulita.pdfIn PDF document text
- http://bubb.cn/up_file/file/gigigomikapitatij.pdfIn PDF document text
- https://muguet.fr/sites/default/files/file/samorogubukonuzigawugagel.pdfIn PDF document text
- http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441e9629c37---bubapazuxefimevodumu.pdfIn PDF document text
- https://htlexpress.com/ckfinder/userfiles/files/fepufunumaxomaposire.pdfIn PDF document text
- https://ispartaprefabrik.com/ckfinder/upload/files/zeredefakuzajara.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_off0000b9fe.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xB9FE	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000d215.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xD215	11304 bytes
SHA-256: `f5be13a992bd72ea3ead2a87dfb505dc24ed9b5241a78b7be4430ff509e177b8`
`font_02_sfnt_off0000ec60.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC60	15992 bytes
SHA-256: `f05e991f7d3cf63cbeaca7cf4fe676e3335d2b6be9474b44c1b5ebeaefc722bb`

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