PDF malware analysis — malicious · b9f1b28e978f9dca

MALICIOUS

PDF

89.0 KB Created: 2021-07-07 23:18:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: 4464c7f49764afb49be6e273dc4cd520 SHA-1: 7ffa2b207ca919bf57ec7e51af058447431c7f9e SHA-256: b9f1b28e978f9dcaef31ac57fb322829523eff4f019d1ffeb05eb9f01e936ec9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure to direct users to potentially malicious websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9942

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://medvor.ru/uplcv?utm_term=first+signs+of+depression PDF link annotation
- https://manenshop.com/upload/files/23440667371.pdfIn PDF document text
- https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/7cd6a166a5ed8a61029993f5a040f8db/bokepat.pdfIn PDF document text
- http://iaestedresden.de/userfiles/file/gudenoromifoju.pdfIn PDF document text
- http://henri-ruch.ch/doc_pub/file/xuxesubikitejov.pdfIn PDF document text
- https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aa879b001e5---revokafopamavumawakopet.pdfIn PDF document text
- http://prunay-en-yvelines.fr/ckfinder/userfiles/files/zewovubofubikerewe.pdfIn PDF document text
- http://dieukhactransam.com/uploads/files/75418229258.pdfIn PDF document text
- http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b22a5299d---6975484089.pdfIn PDF document text
- https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/c046270419e65d6969826633690241b1/mumeposafilufezi.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1a04d0a33e---dezupasiwinizojelotix.pdfIn PDF document text
- http://vipnjl.com/userfiles/files/11088669461.pdfIn PDF document text
- http://ibiforstarlight.org/clients/3/3c/3cfcca4e360ca8807b7dd7d6e7cbeae0/File/xesuvolo.pdfIn PDF document text
- https://planet-for-events.de/userfiles/file/jipemorojodo.pdfIn PDF document text
- http://tafgambiatours.com/userfiles/file/sevuwovuvonukon.pdfIn PDF document text
- https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a14fe4bef6---tikadelijipezuwimuwaj.pdfIn PDF document text
- https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/2750468a535bf53fd4e2aef9c89cb6f0/towobisopoxe.pdfIn PDF document text
- http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609739f3d080d---47356918178.pdfIn PDF document text
- http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608e721e25d56---38595871570.pdfIn PDF document text
- https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9clc03rr8kodtak5bp69dfvsr1/xiwukimubenenol.pdfIn PDF document text
- http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4cdaf2fe7---40837688789.pdfIn PDF document text
- https://agrilaui.com/userfiles/file/62339790219.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743978ce012---54116297631.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/psfhp24jvd1h3v579piqteke2v/dakabekabavixesadugo.pdfIn PDF document text
- http://qkmedica.com/uploads/userfiles/file/7777753625.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_off0000fbd4.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFBD4	16752 bytes
SHA-256: `8744bbc5e0b0af710f234215a1d7d3b7c0cfc2ef1cf7d57e6bdd133f4c7723bd`
`font_01_sfnt_off00012751.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12751	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00013f68.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x13F68	10444 bytes
SHA-256: `bb3ecd78f66d71e9120811c2095173e127a6643fd2334344ead244129773dafa`

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