PDF malware analysis — malicious · 575688ae85065621

MALICIOUS

PDF

85.8 KB Created: 2021-09-18 07:56:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 151f1692e220032707a331fe40bbcacc SHA-1: e6b03b9f7fe5226723533c0480682e1b8c2eeb2e SHA-256: 575688ae85065621a4d4af46f736df3110ef242a644f4ba1f36cf593231939c1

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://drafthe.ru/uplcv?utm_term=video+converter+apk+for+windows+7 PDF link annotation
- https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/df640a7e639e3403a8467d4929b804bb/22024341971.pdfIn PDF document text
- http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/36536393613.pdfIn PDF document text
- http://ecohost.ru/pics/images/file/57599152741.pdfIn PDF document text
- http://aspbae.org/userfiles/file/fitikevavojelopuro.pdfIn PDF document text
- https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392476dd697---julajowobogunozarozej.pdfIn PDF document text
- https://keluargamimpi.com/contents/files/53496742342.pdfIn PDF document text
- http://imobilestore.de/userfiles/file/korajenutonupemu.pdfIn PDF document text
- https://taichielite.com/louis/taichi/ckfinder/userfiles/files/131291093.pdfIn PDF document text
- http://www.uc-kushiro.net/images/library/File/retajatulirivuz.pdfIn PDF document text
- http://quiltingacademy.com/fckeditor/userfiles/file/busupis.pdfIn PDF document text
- https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/dazoturaxizusigagixax.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/60544164661.pdfIn PDF document text
- https://geniodelweb.com/file/nekofixasijovozenala.pdfIn PDF document text
- https://officialbacknumber.org/editor_up/bofutipudojexaku.pdfIn PDF document text
- http://cdenito.net/userfiles/file/samukasepimazafobuzazex.pdfIn PDF document text
- http://autoset66.ru/admin/ckfinder/userfiles/files/51820785211.pdfIn PDF document text
- http://wildzipper.com/clients/wildzipper/userfiles/file/47330643759.pdfIn PDF document text
- https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e59111c41aa413f2ae1b88d0ded92bd0/tolenadaruzafajerumubugi.pdfIn PDF document text
- http://kammerchor-lindau.com/file/fetulaxaxuluros.pdfIn PDF document text
- https://artbynela.com/uploads/file/42256043763.pdfIn PDF document text
- http://le-lemniscus-incandescent.fr/ckeditor/upload/files/xibesu.pdfIn PDF document text
- http://gameometria.com/assets/ckfinder/core/connector/php/uploads/files/kurabatedetolepixudirus.pdfIn PDF document text
- http://parfumerieindex.nl/images/uploads/73093786672.pdfIn PDF document text
- http://tencanpowder.com/d/files/xasomen.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_off0000e7da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE7DA	10828 bytes
SHA-256: `5ed2b2c3ee7436b5c7492af7064043bf0cba8bb1cd15c82515bb4418868c10eb`
`font_01_sfnt_off00010126.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10126	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011938.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11938	18524 bytes
SHA-256: `c4b8a35dcab52a2571c9f21bbbb5f6c14a98b4081259650f83551b2bcd4c101f`

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