PDF malware analysis — malicious · 0099adcf7e87c729

MALICIOUS

PDF

84.2 KB Created: 2021-06-29 08:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: 5f17afab00ae92414e7aef65250091cb SHA-1: 003d1f0b155b0c386e997d4dbe37cc7733bfc407 SHA-256: 0099adcf7e87c72900c474c47757331fe7ef399e2b39603890adadf0ef255110

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document contains a link farm with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of numerous external links and the nature of the heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9956

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://crewmak.ru/uplcv?utm_term=top+stock+decliners PDF link annotation
- https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/877c7c54d2c811a6bcfd8b5aeb26f243/79507035150.pdfIn PDF document text
- http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/9a61aa585224720236a6132c9a31846d/kivofevejupid.pdfIn PDF document text
- https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/nguurbnahdvhm3fjr6rro7qogf/1214340228.pdfIn PDF document text
- http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd2727396---bofimomidu.pdfIn PDF document text
- http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a74bf9d94ec---87508905558.pdfIn PDF document text
- http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60f2dd958---3318233847.pdfIn PDF document text
- http://happyhanool.com/ckupload/files/semebar.pdfIn PDF document text
- https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6b5a43e925f993d3e6d36363eb3d918a/zubapaxuzuwinelu.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc0afb55e3---vobofefimaliramexawa.pdfIn PDF document text
- http://tourister.kr/userfiles/file/41993628839.pdfIn PDF document text
- https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/efe206874d3a2aa9a9bfd1aa3f8d71bf/25297020709.pdfIn PDF document text
- https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/fae9dcd4da8822f1f48de07201e90118/nolurinoxa.pdfIn PDF document text
- http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/sdji6tq64pdu72fpaq6p6rbm32/90043814092.pdfIn PDF document text
- https://hansenlight.com/UploadFile/files/46167204786.pdfIn PDF document text
- https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ab01226ee62c22bf92e852ae0291af92/4080521328.pdfIn PDF document text
- https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/3a976e1376fee94db08d1ffde71d511f/63810253635.pdfIn PDF document text
- https://ytdrive.com/CKEdit/upload/files/widijid.pdfIn PDF document text
- http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afbdf45fdb6---35145283793.pdfIn PDF document text
- http://koryosushi.com/uploads/files/50485842807.pdfIn PDF document text
- https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/d374ea675938936b93b9e5ce0febb91c/zozipewavopetigala.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d1fa2ba81---20732504035.pdfIn PDF document text
- https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740f005c37a---badijo.pdfIn PDF document text
- https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/519d036f7bb9fbab71fb29283e809481/47684085446.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_off0000e4d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE4D6	10400 bytes
SHA-256: `96eeeb4e875af2e538acb495988c988eb481151fcaaee6c9641ba05649f97265`
`font_01_sfnt_off0000fc84.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFC84	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011496.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11496	17280 bytes
SHA-256: `d2cc774cbda9517ec826f7bf4fe985e38b4d3633fbded439178ca3537ab7fa2d`

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