PDF malware analysis — malicious · 3dc15324bcfd0fc5

MALICIOUS

PDF

84.7 KB Created: 2021-07-03 17:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25

MD5: 055cfdade05efb2ba4add496167cfcff SHA-1: d44bd28996d31da2036e7772ab7ddde04ce71329 SHA-256: 3dc15324bcfd0fc568a25f4dd7571973b8112771eb1512e4355b1d3c8cd3afa4

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for phishing or further malware. The presence of multiple external URIs and link farms on disposable hosting suggests a campaign to lure users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9951

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://smidgel.ru/uplcv?utm_term=notes+from+underground+pdf+free+download PDF link annotation
- https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/9si4n27rr963koloelekh3vl3b/xetulizisititilafekisegeg.pdfIn PDF document text
- https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc422a10a5---tunife.pdfIn PDF document text
- http://asiancfea.org/userfiles/file/24434641965.pdfIn PDF document text
- http://whatifitspossible.com/ckfinder/userfiles/files/godegat.pdfIn PDF document text
- http://thebankcardservices.com/uploads/files/kudafenaduxumarel.pdfIn PDF document text
- http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c14eaa5aba3---73927206185.pdfIn PDF document text
- https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb45edc1970---80714622105.pdfIn PDF document text
- http://designbeginnings.com/upload/file/43942557535.pdfIn PDF document text
- http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160927acbe9b89---6626388400.pdfIn PDF document text
- http://boekenwinkelindex.nl/images/uploads/pepezorem.pdfIn PDF document text
- https://chmelo.hu/sites/default/files/file/58889113097.pdfIn PDF document text
- https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/ocb604027frn0dd48lgudde1l6/87476184817.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0df13c7c48---95467847296.pdfIn PDF document text
- http://lovec.bg/root/ckfinder/userfiles/files/81946407532.pdfIn PDF document text
- http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160869d381f8a8---guvumi.pdfIn PDF document text
- http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160784809db633---xisute.pdfIn PDF document text
- http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2117a0fae9---25367617101.pdfIn PDF document text
- https://istanajpdua.com/contents//files/78865689853.pdfIn PDF document text
- http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f67935441---guzovutumezinimofez.pdfIn PDF document text
- http://bora.su/ckfinder/userfiles/files/silifowabegizebanipa.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160751e1e7e19a---2482916687.pdfIn PDF document text
- https://leosservices.com/userfiles/file/5362471058.pdfIn PDF document text
- https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/b442da63941c01939b5be6a9033bc7ae/kapomipevopobiponakakedaf.pdfIn PDF document text
- https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/af460fa0d7494cda3b64b490ffafb3bc/wefinukifevuge.pdfIn PDF document text
- http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/29320129881.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_off0000dbb3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDBB3	10912 bytes
SHA-256: `931d3300e450bcb196e94b6f34f4bc6cc7b4207290f6a7e314a6d2b9d377aa9b`
`font_01_sfnt_off0000f4d9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF4D9	22148 bytes
SHA-256: `1ede92ada9863478b7f490fd81d192dd66db7fee5ae402276550acc0a67f8a40`
`font_02_sfnt_off00012d2c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D2C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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