PDF malware analysis — malicious · 6cd2086d3b908159

MALICIOUS

PDF

76.2 KB Created: 2021-07-01 23:23:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13

MD5: b95903ae4ed7185081aa08317248fc0f SHA-1: ada7f6922d1f4bab17de0161d5cce81e703d8676 SHA-256: 6cd2086d3b9081599f989a51286a3afd8dfd8b93edd3d19a905cb561070cd648

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as containing a link farm on compromised or disposable hosting, with a high ML score and ClamAV detection confirming maliciousness. The embedded URLs suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment. No scripts were extracted, but the presence of numerous external links indicates the primary malicious function is redirection.

Machine Learning

Nyx PDF Classifier malicious score 0.9953

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=vice+admiral+brown PDF link annotation
- https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/thcfs0vcm2vd1j8g2ue2trjg80/93265664723.pdfIn PDF document text
- https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160729558bea7c---9564497860.pdfIn PDF document text
- http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/7a600fa50cf73666229dfaf24da60640/68923673319.pdfIn PDF document text
- https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/a60610c488130b7c70767e2855d51885/nabajobogubovibimofos.pdfIn PDF document text
- https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/c6660dd527f8e3165be4ad41e23cf65b/pibofixize.pdfIn PDF document text
- https://ckmandarin.com/uploads/kulesikenafozelajudi.pdfIn PDF document text
- https://emprenderem.cl/files/64770415774.pdfIn PDF document text
- https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/97f749cb2ec52ba755652533b4d17742/fuzividu.pdfIn PDF document text
- http://womensmentalhealthmd.com/clients/9/9a/9a9ccad1be43d50cbc9928f06550b956/File/6991395560.pdfIn PDF document text
- https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a37edcb75be---81632081211.pdfIn PDF document text
- https://kawanmto.net/contents//files/vumajoko.pdfIn PDF document text
- http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084efb8e3b10---febogovobuxepux.pdfIn PDF document text
- https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/k8fmeditr84cq3cdar9kodakna/38625914849.pdfIn PDF document text
- https://primer-spb.ru/files/files/batin.pdfIn PDF document text
- http://familiehollander.nl/images/uploadedimages/file/zinogotatojaj.pdfIn PDF document text
- http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609dfc08c4161---34756485628.pdfIn PDF document text
- https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/efsq5sabcsem6egmtquliu1pso/81136114588.pdfIn PDF document text
- http://presssimayeshahr.ir/pic/file/xixavojenagipomad.pdfIn PDF document text
- https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/b67686cf80749b5ec51739abd72c5345/49719484931.pdfIn PDF document text
- http://raegcafe.com/uploads/files/5231969644.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/bvell07n1li98gbtect955qls5/94566998637.pdfIn PDF document text
- https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/a6247f7c503b7be2ed2567cd0427f3bc/muretikagugujixowikigobat.pdfIn PDF document text
- http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb91d06586---parura.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_off0000c953.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC953	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e16a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE16A	10460 bytes
SHA-256: `5c6faf01bdf1dbd7b4c6f5f9b5b57f4e27479df858cc63584514a42eed38029b`
`font_02_sfnt_off0000f918.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF918	16588 bytes
SHA-256: `523a25cba4bde0b477485d30a713ac2f30f0103f3d144000768b4bd858afac6f`

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