PDF malware analysis — malicious · aec8dbda5ba242cb

MALICIOUS

PDF

82.8 KB Created: 2021-09-02 03:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27

MD5: 620c893f7eb16b1429b3e6a5b0354c1c SHA-1: a1c3e40cf37e5a3eea4408f87c92cf106e4dd8f7 SHA-256: aec8dbda5ba242cbe20d22ef9a80e1100d1b61cfb98273cec09345edf4053254

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution lure.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

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://nomylo.ru/uplcv?utm_term=connecting+prior+knowledge+to+new+learning PDF link annotation
- http://worldtile.net/jangheung/userfiles/file/13926126552.pdfIn PDF document text
- http://kirsanov-maslo.ru/uploads/xazefexakafipobofesu.pdfIn PDF document text
- https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a88d7d7d5d---93397102308.pdfIn PDF document text
- https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5335061d4---88865821654.pdfIn PDF document text
- http://ahcxdq.com/uploads/file/022119054556.pdfIn PDF document text
- http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b80638296be---vanunamiti.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4d81e440cdc5cac5c9bb6cfb1a63fbb6/gujolumewexedaxazaxopu.pdfIn PDF document text
- https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/gf44rkuej6v78g1othms5rek55/41302174670.pdfIn PDF document text
- http://djpress.pl/Image/files/80418232275.pdfIn PDF document text
- https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/ep6ht4c8uhftfd6ncacvhfglo5/3544379928.pdfIn PDF document text
- https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/60cmncbl925r159l2lsn7i0cc4/77825945429.pdfIn PDF document text
- http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e5305ab6---95234015694.pdfIn PDF document text
- https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/8d9a63c14ba465bac7ffbbe71fcd7609/84304900343.pdfIn PDF document text
- http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f34994c5a2---20192192737.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65ce4df1f5c333fb82605c5324cc1427/taxogelorisavo.pdfIn PDF document text
- https://ijp2.com/contents//files/peramakom.pdfIn PDF document text
- http://svsteinfurth.de/radsportfiles/file/87438412523.pdfIn PDF document text
- https://darshanam.com/ckfinder/userfiles/files/puxiwumiparumujeko.pdfIn PDF document text
- http://poultech.net/d/files/rodofotopizuwix.pdfIn PDF document text
- http://ipceurope.com/assets/file/jigazizupaxegodifo.pdfIn PDF document text
- https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082330ae68b2---zozukoxarokapudososa.pdfIn PDF document text
- http://olympusflights.com/files/files/46370148367.pdfIn PDF document text
- https://fluffy-chins.com/images/file/13480769909.pdfIn PDF document text
- https://harmony-lazienka.pl/Upload/file/wuzufabemesaranavanadus.pdfIn PDF document text
- https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736159c9cf2---supunotigi.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_off0000de28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDE28	10728 bytes
SHA-256: `7fd7a41655d005c18531cda7a7fc946235dda02d7e9c6eec23f4a1ed7fda8a30`
`font_01_sfnt_off0000f6cc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF6CC	17528 bytes
SHA-256: `f2058a990f496806a365a3180a45bf4a3a804090283f4c2fe993e0265089365b`
`font_02_sfnt_off000123c9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x123C9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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