PDF malware analysis — malicious · 43723f91e176fb4b

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 15:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05

MD5: 2557a2ebdbfe7c824adbb1c2fb42e15c SHA-1: f9016b54995cf6cfcfa8d8579cf8885214d75b64 SHA-256: 43723f91e176fb4bb98d785c5bb80e861c7004811d529632b99fb63e168418a1

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites, suggesting it's designed to redirect users to malicious content. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

Nyx PDF Classifier malicious score 0.9896

Heuristics 7

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.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
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://philabc.ru/uplcv?utm_term=women%27s+clothing+donation+center+near+me PDF link annotation
- https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/dgr28o7mhittmog2u0plah0u9c/xalesifiwukusutu.pdfIn PDF document text
- http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f31fbe0cd85---9316615493.pdfIn PDF document text
- https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2b9b86f1---baxasinijejaguwawofuwibet.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ca3c9f18bcc---94531199393.pdfIn PDF document text
- http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d8d395458---fepoxufuf.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088d58257bb0---muzojujetadegowovixu.pdfIn PDF document text
- https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9a621c1f19---rikidedisujexafitukaguxa.pdfIn PDF document text
- http://to-kajihan.net/js/upload/files/41220723171.pdfIn PDF document text
- https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/59964440759f2cdfc8baa97022cf889b/52241522129.pdfIn PDF document text
- https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126a91331a64---71243671948.pdfIn PDF document text
- https://www.passion-rnd.com/upfile/files/2021/07/16/tufuzupazamup.pdfIn PDF document text
- https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/7b7fb20e6f375a9442e15bb6e7ac9165/63477587899.pdfIn PDF document text
- https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d025ab7e64---buwojufuzizizalejibi.pdfIn PDF document text
- https://groupburuemas1.com/contents//files/segug.pdfIn PDF document text
- http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b87039cbed5---68176293896.pdfIn PDF document text
- https://www.delaneyllc.com/ckfinder/userfiles/files/76306358557.pdfIn PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cede64466c7---76745302272.pdfIn PDF document text
- https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1611402c448bbf---ririnonufune.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d82bca18d---50901791141.pdfIn PDF document text
- https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fc0123895e---11231777631.pdfIn PDF document text
- https://dudikom.pl/userfiles/file/64218032744.pdfIn PDF document text
- http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a27da5e673---16009665866.pdfIn PDF document text
- http://www.kilincsweb.hu/fileok/file/navakisosegidofizulezixib.pdfIn PDF document text
- https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ak3uak6modchl1o26qggb584qi/dokidovekasibudazugikusib.pdfIn PDF document text
- http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507230101987696.pdfIn PDF document text
- https://chulintemple.org/CKEdit/upload/files/fowodukinajigokaf.pdfIn PDF document text
- https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/k5ulcg84073p7lb4bqiv3jlv67/senepulola.pdfIn PDF document text
- https://efnnma.org/files/file/sefitadaparogidujemas.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_off0000ee75.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEE75	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0001068c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1068C	10844 bytes
SHA-256: `2461d44929cf50bf258efba80965016e454ca376fe0da01ff20c3ada48797e89`
`font_02_sfnt_off00011f39.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F39	17628 bytes
SHA-256: `6ab1f57eee76c231cefdbf6901049b9d2d98c8f4c6826108b1e32528035424bd`

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