PDF malware analysis — malicious · ff84a893cf78a0e5

MALICIOUS

PDF

81.3 KB Created: 2021-08-17 17:27:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: ef2e5e51ae9cb3448188b42a2043a704 SHA-1: b4a03f4b4aa2e87ad476c3cdf015443cdb0a8733 SHA-256: ff84a893cf78a0e52b7ff0ef05f85e826bae2937b08d91d8648fc577ecd15f2b

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious or phishing content. The document body is heavily obfuscated and contains no readable text, further supporting a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

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://chcial.ru/uplcv?utm_term=travel+intermediaries+pdf PDF link annotation
- http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a52d6322251---64705508685.pdfIn PDF document text
- https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886500e837c---99089074624.pdfIn PDF document text
- http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/zezawalobe.pdfIn PDF document text
- https://alshaabcoop.com/userfiles/file/romuwoxo.pdfIn PDF document text
- https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c863a676---juwafanigewekuworaz.pdfIn PDF document text
- http://acpiindia.com/userfiles/file/taxosivonusigakemiv.pdfIn PDF document text
- http://businessdevelopmentcenter.pl/uploads/userfiles/files/56500172775.pdfIn PDF document text
- http://maybomnuocdanang.com/uploads/image/files/58734721466.pdfIn PDF document text
- https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/0720a23fec31937127137977c1051a94/41842349798.pdfIn PDF document text
- https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b875b9e2872---48117814210.pdfIn PDF document text
- https://kp-bs.ru/upload/files/lanaxeguz.pdfIn PDF document text
- http://kraski-chernila.ru/resources/file/97983978913.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/14e800db7dcae01ab650421e0e4b886a/dawitigaf.pdfIn PDF document text
- http://geoplan.su/userfiles/file/81499583767.pdfIn PDF document text
- http://keiganproductions.com/clients/863431/File/fagowojazirapog.pdfIn PDF document text
- https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/463ca18dd1a80370b6e9778e360d1e77/23756497871.pdfIn PDF document text
- https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/abnnsbs6e5e456ejoa59ouf8nk/mowawagomuruva.pdfIn PDF document text
- http://ddservice-bmw.pl/userfiles/file/wujixotufumojapunobigoz.pdfIn PDF document text
- https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611680ff745ec---32389308612.pdfIn PDF document text
- http://psychoterapia-przemysl.net/img/userfiles/file/repube.pdfIn PDF document text
- http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51232588177.pdfIn PDF document text
- http://ludifrance.fr/userfiles/file/17853034899.pdfIn PDF document text
- http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870fbb22bd0---vojerevufevanarotoxiwaja.pdfIn PDF document text
- http://sotel-perm.ru/site/file/59621080021.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_off0000dd1f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDD1F	16624 bytes
SHA-256: `c938404a767b4b866c24f2c30232f866a0aaf382f2f5f07eb0efaf659b464eed`
`font_01_sfnt_off00010764.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10764	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011f7b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11F7B	10568 bytes
SHA-256: `9c71468d1153c157c0d3a5c1102314c76113a7ae9e09933b4f8d5df095add8d6`

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