PDF malware analysis — malicious · d960c91e2e2a7580

MALICIOUS

PDF

149.3 KB Created: 2021-07-05 06:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: 34d229a9de20e57a848448fe3edd63bf SHA-1: 13509084863156c85102285b333ef31e0caab984 SHA-256: d960c91e2e2a758084265179105d48b37b9a7dc49fbd12e4db6ed39d5a322b9e

184 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with multiple heuristics indicating it's part of a link farm hosted on compromised WordPress sites. The presence of external URIs, including one pointing to a raw IP address, suggests an attempt to redirect users to malicious content. While no scripts were directly extracted, the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9920

Heuristics 8

ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL

PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
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.
Urgency / deadline lure low SE_URGENCY_LURE

Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab5707e355---ponekojibunimiwusujoju.pdf In PDF document text
- https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/0369b126969c989ec844afb80e6584a8/96231152874.pdfIn PDF document text
- http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160796eb6bee8a---53839442706.pdfIn PDF document text
- https://xlspandoek.nl/userfiles/file/wabikawumo.pdfIn PDF document text
- http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e11af0b451---bodenu.pdfIn PDF document text
- http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160878c1e9b113---73220278541.pdfIn PDF document text
- http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac27fa114a---75374371325.pdfIn PDF document text
- https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a0247035a89---33818818005.pdfIn PDF document text
- http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608b7ee15ff46---kitonekefed.pdfPDF link annotation
- http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0963b16ed---rutunazufatopokedozijugi.pdfIn PDF document text
- https://tedvandergulik.nl/userimages/file/jupipigipesenazarub.pdfIn PDF document text
- https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/shn0htds8jj0ukcdpdj3genrkp/wakejovekasosekat.pdfIn PDF document text
- https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/4239c13fb616de2bbc659d6e4ad59d06/bivojomivowujexufuv.pdfIn PDF document text
- https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/160733250ef0e1---98815610857.pdfIn PDF document text
- http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af2d92c62d---zomuboredowu.pdfIn PDF document text
- https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a62b946f005---75274662956.pdfIn PDF document text
- http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/eq9sbq7j5b235pvs99a5471q5v/lananuvusoped.pdfIn PDF document text
- https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/n4f316hg4rgt9k8mvqr30bs0m6/firalusetilozulibiramip.pdfIn PDF document text
- http://anhbanglaw.com/userfiles/file/sesobepobitiwuvixuwisibek.pdfIn PDF document text
- https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/192b6e63161a5140468664a14ace1810/vafutefazuzadejag.pdfIn PDF document text
- https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bf336628b9f---62474126067.pdfIn PDF document text
- https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/68jinihtm697c02un55alkkbp1/nuzuz.pdfIn PDF document text
- https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/4bpp564flf09kc8jf8b41tmj59/38141197798.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=non+monarchical+meaningPDF 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_off0001e85c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1E85C	18060 bytes
SHA-256: `9690ccd080ed484728689f7c7a6d239db308affb2a5d40b8e148b75d059b65b7`
`font_01_sfnt_off000216e5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x216E5	10388 bytes
SHA-256: `047350fa8aa84a3bd3aea9d856f334b600d71a72a50e22e8370d8a4e849032e1`
`font_02_sfnt_off00022e1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x22E1F	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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