PDF malware analysis — malicious · 6fd4699dd527f8ba

MALICIOUS

PDF

84.5 KB Created: 2021-07-01 22:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24

MD5: fd00a94c08d6f6f1dd817e4b93544834 SHA-1: daab2297e9b6af66ab2fe0aef3c4e8eb06148d41 SHA-256: 6fd4699dd527f8ba0172048f1710342f31d80a9f76282143bf4a69d53c5505ad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple distinct hosts, some of which are hosted on compromised CMS uploads. The embedded URLs suggest an attempt to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9780

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 http://volkshilfe-vlbg.at/images/content/files/wiviwivofugosolufuxi.pdf In PDF document text
- https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d03d7d2d5a3---40639073005.pdfIn PDF document text
- https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/ndm1e9t0j28dhoift48ss97aid/44352190602.pdfIn PDF document text
- https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5de02e0c44---78452818697.pdfIn PDF document text
- http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16070868d0a6ad---kulisufebojolanesuxi.pdfIn PDF document text
- https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/ee276a51fc288b85ce13c5395426d45f/74582139689.pdfIn PDF document text
- https://mvservice.it/file/rarekuvaxusifadarogabin.pdfIn PDF document text
- http://614move.com/clients/4890/File/serinekigezejoz.pdfIn PDF document text
- http://7166867.ru/ckfinder/userfiles/files/dofafekenutoboxizawara.pdfIn PDF document text
- https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/28a9d9f81a28f93e1455e948d2795275/mogilusos.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/0ec7bb9844dd083a068307463f5d0813/nenalimilamarunaxabasibep.pdfIn PDF document text
- http://fitviewer.biz/files/file/72123506320.pdfIn PDF document text
- http://cgl.lu/userfiles/files/18076338906.pdfIn PDF document text
- https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608007e64aac6---katevajo.pdfIn PDF document text
- http://noithattamphuong.com/upload/files/wavumudopolojeluf.pdfIn PDF document text
- http://allaboutdowney.com/userimages/58516620280.pdfIn PDF document text
- http://auto-spec.ca/fck/file/fepedolaf.pdfIn PDF document text
- https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/54omur5g49seerjm1rsf7a214g/manuxoxal.pdfIn PDF document text
- https://kovtec.pl/eurostyl/photos/file/sedew.pdfIn PDF document text
- https://aedwea.com/upload/foto/nexotuzuwigu.pdfIn PDF document text
- https://ratco-hardware.com/Ups/files/21449018175.pdfIn PDF document text
- https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb7ab70409---dozawitusalixeki.pdfIn PDF document text
- https://podereilmontaleo.it/writable/public/userfiles/file/xogepasigokaxixawipi.pdfIn PDF document text
- http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/56286094339.pdfIn PDF document text
- http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e56fb57ab---9460769916.pdfIn PDF document text
- http://waberry1969.com/clients/877040/File/kebegesibapawifunudam.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=five+night+at+candy%27s+apkPDF 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
`font_00_sfnt_off0000c90f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xC90F	10812 bytes
SHA-256: `b46c3a17abafc98e4f606f5bfb32d0649c8459c827d4cddbaca88718be83df28`
`font_01_sfnt_off0000e1ce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE1CE	16140 bytes
SHA-256: `00b1f632e8afe72716c8bcdb76b7901b56c060d1dc0f96f3f5c1b8373b85735b`
`font_02_sfnt_off0000f746.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF746	20084 bytes
SHA-256: `4d7a87e6d73909e3fa447e4ce4b3c5f4b3d25376cd8d1e25f3b893051c535886`
`font_03_sfnt_off00012a05.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12A05	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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