PDF malware analysis — malicious · 55f09ce4d3ed1956

MALICIOUS

PDF

85.6 KB Created: 2021-08-22 01:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: dcbe18c7491f5d372bf53a6cab437199 SHA-1: 31f194740a98bfc5d735fef3297859c3392d3a0a SHA-256: 55f09ce4d3ed1956eab983157136c0983e4733924676b7a94f410614eaaa4838

164 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, likely intended to host and distribute further malicious content. The presence of external URIs and a link farm suggests an attempt to redirect users to malicious downloads or phishing pages.

Machine Learning

Nyx PDF Classifier malicious score 0.9911

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.
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
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://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611958d46b54b---mugikep.pdf In PDF document text
- http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/lco8qk1h7nt7f37h2t12vpsvk0/sifuzupikuwilo.pdfIn PDF document text
- http://rfaaa.com/UploadFile/file/20210817111242463.pdfIn PDF document text
- https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/8c8422752c1420fe2f4dd184486b8722/13042885508.pdfIn PDF document text
- https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/76609604a78515d84257f0aeb6b42aaa/97253347501.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606d91a03fcc1---tudafaxajidakekironunitup.pdfIn PDF document text
- http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/ltq6kfkb6itpcpa71dr0vqcrjf/5301281417.pdfIn PDF document text
- http://podlahypilat.cz/admin/file/jepedew.pdfIn PDF document text
- https://ctapigroup3.com/contents//files/poxepirisugamegiroviz.pdfIn PDF document text
- http://diagnosticaedilizia.com/userfiles/files/mexibajagabejifegiwev.pdfIn PDF document text
- http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/snunpu92ru2gurn55ci67skb66/xamiterubogirivunutano.pdfIn PDF document text
- http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dfc16a913---30308015672.pdfIn PDF document text
- http://citywideok.com/clients/75789/File/benewizojalifirej.pdfIn PDF document text
- http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f53361e71d---70126560396.pdfIn PDF document text
- http://www.aqsclimited.com/EditorImages/file/2481078570.pdfIn PDF document text
- http://neodermclinic.com/file_media/file_image/file/jotogazazevagawolo.pdfIn PDF document text
- https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abb4148be5e---34500998309.pdfIn PDF document text
- http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7g2e84g54iasu73o5n8b9vlk40/rokawivoleke.pdfIn PDF document text
- http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16098c079635eb---debidujatevusudejakan.pdfIn PDF document text
- http://samnakthodrahassob.com/userfiles/file/remakal.pdfIn PDF document text
- https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/23c5119eb83c597ea1c16d8b1ce6df91/fakibarolunujebederoj.pdfIn PDF document text
- http://shavers-boles.com/clients/7/73/73b1ad2e2c85410b7b015c0c79a6caf4/File/tolatusedawujuzu.pdfIn PDF document text
- http://aftckwt.com/uploads/file/4813721509.pdfIn PDF document text
- https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/859606ed3c96673d0d5c96d33bf35370/68725917752.pdfIn PDF document text
- https://yocarbroker.com/upload/ckfinder/files/13861087274.pdfIn PDF document text
- http://www.sictombbi.fr/ckfinder/userfiles/files/janiroxazuzizumuwew.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=forecasting+templates+excelPDF 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_off0000ea41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEA41	17028 bytes
SHA-256: `f3e21b38e65f2dea16871cc97b2c6b21b182effc9aecc544c31f733cf07135d1`
`font_01_sfnt_off000116c0.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x116C0	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00012ed7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12ED7	10796 bytes
SHA-256: `ca51041a5d26d7685fa95def34b32671d0d77715d101483414f763f0ac807069`

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