PDF malware analysis — malicious · c816031ba5323aa1

MALICIOUS

PDF

90.0 KB Created: 2021-09-02 02:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12

MD5: d469544820a7167a3db29194a7aa18f7 SHA-1: 99d56d6934c77d54572c422766aa38d31117a5ff SHA-256: c816031ba5323aa109c56deaa2786153a56d867d6dd3c212816fd3cfc41a204f

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely lead to further malicious content or phishing pages, indicating a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9973

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://fiberglasssupplydepot.com/userfiles/files/63288314311.pdf In PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/acfa37dda8777fe192db3eb34b73cc58/89708542623.pdfIn PDF document text
- http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/78526303966.pdfIn PDF document text
- http://hamyarsanatco.com/ckfinder/userfiles/files/dobisoriratinovetoweti.pdfIn PDF document text
- http://eatatrudy.com/uploads/files/47745197721.pdfIn PDF document text
- http://www.cenlaenvironmental.com/siteuploads/editorimg/file/70230275229.pdfIn PDF document text
- https://unique.global/wp-content/plugins/super-forms/uploads/php/files/7a64149fc80e79a6e0215f0e7c163ed7/pibolirarajovumubaxe.pdfIn PDF document text
- http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc43ac7fb7---nijufabonoperiruwexo.pdfIn PDF document text
- http://botosani.ro/img/uploads/file/pewisifobuf.pdfIn PDF document text
- http://macphersonproperties.com/clients/876251/File/72855063845.pdfIn PDF document text
- https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/86862f1151759d9ec2593f824e00233c/84502383604.pdfIn PDF document text
- http://sowiik.pl/userfiles/file/lalusigigetijejod.pdfIn PDF document text
- https://ahreco.com/uploads/news_file/wometemofi.pdfIn PDF document text
- http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ffd118379d0---lipebe.pdfIn PDF document text
- https://flomogroup.com/upload/files/22744268072.pdfIn PDF document text
- http://lapenya.cat/imgjovesnaves/file/rixomezijokokewaguxul.pdfIn PDF document text
- https://aokman-drive.com/d/files/70879334707.pdfIn PDF document text
- https://kop-trans.pl/uploads/userfiles/files/kaladaxunubezim.pdfIn PDF document text
- http://fqcycpa.com/jingkelun/userfiles/files/20210624042309.pdfIn PDF document text
- http://tasarimak.com/ckfinder/userfiles/files/sivugode.pdfIn PDF document text
- https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/63ac5418bfac3af4e6013d1d8ff73a5f/19910639498.pdfIn PDF document text
- https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bb364dfad708df4114172e3e0c3c6ae2/wobaxiduxepupurepupupamor.pdfIn PDF document text
- http://ahlhy.com/uploads/file/271454406102.pdfIn PDF document text
- https://beytarimcilik.com/admin/editor_resim/file/3435013658.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=life+number+9PDF 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_off0000fb1c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB1C	19180 bytes
SHA-256: `ed93cc69ebad28518f4a518070bf650f7127cb7bb652c83355b58993b7893757`
`font_01_sfnt_off00012baf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12BAF	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000143c6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x143C6	10148 bytes
SHA-256: `0d29305fea56479acd3cae3ca336846e4166beacffea68578d64df4fb6a7da49`

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