PDF malware analysis — malicious · 8f6fdc25f7540c66

MALICIOUS

PDF

94.3 KB Created: 2021-08-03 10:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: b8bcd443cbaca5fbf4b84f54c0714439 SHA-1: baf245380d90d63c777401681da27d88120cdc0e SHA-256: 8f6fdc25f7540c66e924caf9e0b7c39037e6e79f8bf520d5aa66ffcfbc38aa95

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the PDF functions as a link farm, with many URLs pointing to potentially compromised or disposable hosting. While no scripts were explicitly extracted, the nature of PDF link farms often involves JavaScript to redirect users to malicious sites, hence the inclusion of T1059.007.

Machine Learning

Nyx PDF Classifier malicious score 0.9924

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://siam-royal-view.ru/data/files/66556697437.pdf In PDF document text
- http://aaaexpressheating.com/userfiles/file/jovuximanosiz.pdfIn PDF document text
- http://vasvaripalmuzeum.hu/upload/file/90793603475.pdfIn PDF document text
- http://geasit.it/userfiles/files/wasuzebuk.pdfIn PDF document text
- http://fecirturizm.com/resimler/files/jelifumisut.pdfIn PDF document text
- http://tumwebthailand.com/ckfinder/userfiles/files/jabijavoxiraridafub.pdfIn PDF document text
- https://ebooksweb.net/files/file/36571846949.pdfIn PDF document text
- https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/pfidej6jeps8g9o2u3g4v2urp8/77294064711.pdfIn PDF document text
- https://silga.ca/userfiles/file/fibelenunurul.pdfIn PDF document text
- https://aparcaderoshaddaichile.cl/uploads/images/files/ritolenetiwe.pdfIn PDF document text
- https://mediaget.ru/userfiles/files/xalitajimopuraruvub.pdfIn PDF document text
- http://digitalpolicycouncil.com/imagenes/file/vibotixapabigagorodowal.pdfIn PDF document text
- https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd7bedaf0---84469648548.pdfIn PDF document text
- http://ingenermarket.ru/userfiles/27235818463.pdfIn PDF document text
- http://lohs69.com/clients/82366/File/48113787510.pdfIn PDF document text
- http://mudrkanuch.sk/editor_uploads/system/files/1386984222.pdfIn PDF document text
- https://ratsimae.eemedia/contents/file/44612210838.pdfIn PDF document text
- http://lionsmarsala.it/userfiles/files/79929518544.pdfIn PDF document text
- http://americanpetrochemicals.com/customers/CMS-IMAGES/file/82739217588.pdfIn PDF document text
- http://jjkxmy.com/upload/files/202107292147203058.pdfIn PDF document text
- https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/q16ceqt7i9l0nb7c9c9fo4e0t2/29847648913.pdfIn PDF document text
- http://espacioschillout.es/images/admin/file/bimewutikojulemin.pdfIn PDF document text
- http://carriewoodfamily.com/clients/5/5b/5b9f2fb360c4065436fb7fe1267c3612/File/82007879455.pdfIn PDF document text
- http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/32684037741.pdfIn PDF document text
- https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/8c2a1060c6770097e2de727fd55fe862/93835824318.pdfIn PDF document text
- https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=gta+vice+city+100+mb+download+for+android+apkpurePDF 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_002_off0000d2f2.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xD2F2	29976 bytes
SHA-256: `e6bc53209311ca51091e4955f74574b5ade7e525f8b26d8d50a551a31fa0e75c`
`font_01_sfnt_off00010866.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10866	17924 bytes
SHA-256: `0a8e1368b1cd09eca251195cffdb2c0dedae89e7bd64c01e61b65820cfd2a6bb`
`font_02_sfnt_off0001360d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1360D	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_03_sfnt_off00014e24.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x14E24	11424 bytes
SHA-256: `e33821ab7ad4395ed2c741d9ceb2729460ee35d600c0c9fe2d955c1112d58cb3`

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