PDF malware analysis — malicious · e318a68125dec4f6

MALICIOUS

PDF

94.8 KB Created: 2021-08-23 12:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: d894615b257dbc08cff277605c6c31a4 SHA-1: 5cc1a5b5f46bd5f04cb1140f857e9c8c3b7ac379 SHA-256: e318a68125dec4f6d5bbab583cbb1a56d0a302574433d3613fe1853b7113dbd9

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's part of a link farm, with several URLs pointing to compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically identified as phishing or a trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a phishing lure or a downloader for a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9914

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://viveironativodevicosa.com.br/ckfinder/userfiles/files/fudowoxek.pdf In PDF document text
- https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1190525202---sobupojusikilup.pdfIn PDF document text
- http://brightwayconsultancyservices.com/userfiles/file/66327265649.pdfIn PDF document text
- https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/5190192777.pdfIn PDF document text
- http://fioredda.com/userfiles/files/25380290355.pdfIn PDF document text
- https://www.pactforfamilies.org/ckfinder/userfiles/files/vuwuvovivisaliligano.pdfIn PDF document text
- http://anandtouristcorporation.com/uploads/kenoguwadujemuni.pdfIn PDF document text
- https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/70b63a4d5dc4058ea4579a53ad09146e/zuwofilupunatatipezu.pdfIn PDF document text
- http://cyuanmei.com/userfiles/file/55700732257.pdfIn PDF document text
- https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/4ca741480c57f14bb223d9b5df18d723/fusasebakibiv.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4e567d3fa---69421209792.pdfIn PDF document text
- https://kingcarmotorista.net/uploads/files/13479436415.pdfIn PDF document text
- http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ab15323bb91---gaxozolonuboduxuvojov.pdfIn PDF document text
- https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/tss7bn1c9muhl7mbrpvlfp73ul/nadorilapad.pdfIn PDF document text
- http://aiswaryamatrimonials.com/fck_uploads/file/93210930208.pdfIn PDF document text
- https://master.plus/wp-content/plugins/super-forms/uploads/php/files/c7d2b13498bdb246cd3b2b2bed9eda94/jemiluweliwi.pdfIn PDF document text
- https://onlineadda.net/ckfinder/userfiles/files/videk.pdfIn PDF document text
- http://pbhdom.eu/userfiles/file/98647915493.pdfIn PDF document text
- http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc97a50e35---18830136504.pdfIn PDF document text
- http://notarbrazda.cz/userfiles/file/dexitanifonofo.pdfIn PDF document text
- http://munnarinfo.in/userfiles/file/fesewopapelakanasirovonem.pdfIn PDF document text
- https://iphonerepairservice.nl/app/webroot/files/userfiles/files/xenonirokapimunuduvom.pdfIn PDF document text
- http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/53k5if076670233vhe77q6tg9i/62085889455.pdfIn PDF document text
- http://universe-micro.com/upload/files/20210624_013040.pdfIn PDF document text
- http://solar-makernavi.com/ckfinder/userfiles/files/roxitinokebobugo.pdfIn PDF document text
- https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/mvl1lcnp647fr71vkn4me8k79s/34749146854.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=a+doll%27s+house+by+henrik+ibsen+analysisPDF 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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_005_off0000ec2f.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xEC2F	20920 bytes
SHA-256: `0d94922acec72d101042d3740be9121e1b0f1459d4a2fbe40fc046c3e71b633b`
`font_01_sfnt_off0001101b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1101B	10708 bytes
SHA-256: `0ba24c837fc4ec49f2e3a48c6b64d27b585dab678620c3c09149e98f420db8e3`
`font_02_sfnt_off000128a9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x128A9	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off000140bb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x140BB	17076 bytes
SHA-256: `aabb031f6dce964877487f653338e19f1b8d7e8c26a7a6c805fca0c40028882e`

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