PDF malware analysis — malicious · 3c1fdfb59d338305

MALICIOUS

PDF

75.9 KB Created: 2021-08-06 23:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ff01f8635c3cd29b634117525a0d0342 SHA-1: a81414ea8e9b38c405a673f912e124c57ec0a8d3 SHA-256: 3c1fdfb59d3383053ff3636549c24ec68e42629f563b94eedf07b11cad02cfeb

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure victims to potentially harmful sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/e00d27392a22cf0f2e6a291b41375d11/rudexidizimowuriwofijoji.pdf In PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160798cb4e9b4e---nuxim.pdfIn PDF document text
- https://eliteplacementagency.com/uploads/files/53229409189.pdfIn PDF document text
- http://dongduong.net/Images_upload/files/sofemamefubikorekibel.pdfIn PDF document text
- http://varosom.hu/userfiles/files/65479513246.pdfIn PDF document text
- https://grupahatak.pl/admin/_fck_files/file/valizewiwekebufufemumove.pdfIn PDF document text
- http://www.dkmodels.net/ckfinder/userfiles/files/jonevesubelovete.pdfIn PDF document text
- https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c07ec62e462---wubifuwuxo.pdfIn PDF document text
- https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/8eec917037fd60b610d87ce514e786f0/zofatokaxojiwes.pdfIn PDF document text
- https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082d826e07b4---luwoponapadabenu.pdfIn PDF document text
- https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608fcba7a73b5---xakewurepulafotonasumamol.pdfIn PDF document text
- http://creativeindustries.ru/uploads/userfiles/file/wogofamon.pdfIn PDF document text
- https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/1bolcgtlqahu9l0rdmsjpm39hg/53720836700.pdfIn PDF document text
- https://anmoul.com/userfiles/file/24393148526.pdfIn PDF document text
- https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/ojr8k8hj1hpesg33toh9g79v60/pabulibot.pdfIn PDF document text
- http://tcihk.com/userfiles/legefomosiwoxe.pdfIn PDF document text
- http://rustproofingottawa.com/userfiles/file/72228300527.pdfIn PDF document text
- http://zzweien.com/d/files/wunufenetisanazupav.pdfIn PDF document text
- https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/ab5ae1a09cc4cf097f12a7941993e0be/29022102787.pdfIn PDF document text
- https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/7a1e15789d13ba60dfdd823dac45364c/sidovoxezoje.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b490b749116---dawelegexapumokokoguv.pdfIn PDF document text
- https://readandenjoy.ae/userfiles/files/6818282681.pdfIn PDF document text
- http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb009c9936---79088198587.pdfIn PDF document text
- https://bselink.com/userfiles/file/wozobefarifusetej.pdfIn PDF document text
- https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/6ff1f2948a071b59a353535c7da05a53/gogotitabufetejivevevog.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=carbonato+acido+de+calcio+formula+quimicaPDF 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_off0000c116.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC116	10888 bytes
SHA-256: `27237784b9c294bfbbb73428270f1e9b13668ced3231379bfc39847408bc6dea`
`font_01_sfnt_off0000da09.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDA09	18428 bytes
SHA-256: `d9b0488e61e0c383d6d969c14b5d962d86286f3c01a18c59f02d43c971f60f4d`
`font_02_sfnt_off0001077d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1077D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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