PDF malware analysis — malicious · d62214b2f1645958

MALICIOUS

PDF

78.3 KB Created: 2021-07-26 02:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26

MD5: 61b8108281e367b32a03040f1b2d6081 SHA-1: 7003764fba492cfc2b7801468abc5983b34bfb6d SHA-256: d62214b2f1645958fcccb81ac54abfa00bd9f16b18d0985cd3ea2b5f74e4eb6a

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable domains, indicating a link farm or redirection scheme. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were extracted, the structure and URL distribution suggest an attempt to lure users to external sites, potentially for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

Heuristics 5

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://iword.de/userfiles/file/56978783405.pdf In PDF document text
- http://polyalpan.hu/_user/file/divugo.pdfIn PDF document text
- http://xn--kprq5pvqklteonubj6c.tw/CKEdit/upload/files/neworedabofuraroga.pdfIn PDF document text
- http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1eb1fa6c75---27155988311.pdfIn PDF document text
- https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/de12fed9cf5bf6be105d566320c34af3/jipezikop.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ba3533da5b9---bulagujuwosapujekujose.pdfIn PDF document text
- https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/kmruf6nku656gapum9edo4guqe/79618956651.pdfIn PDF document text
- https://srilangkapools.com/contents//files/jegulapedelibekadamulof.pdfIn PDF document text
- http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f53e7771d3---57588832367.pdfIn PDF document text
- https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/9fec8e3f051021eb900ae01cc74381e9/3996599416.pdfIn PDF document text
- https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/2n44ou19jk7kkokdjfltsprudh/gurijimezovil.pdfIn PDF document text
- https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/989d794c49a9ea004e807d206ac74cbe/10029147990.pdfIn PDF document text
- http://banhangcongnghe.com/upload/FCK/file/68872291992.pdfIn PDF document text
- http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093d36886b76---debokilemiwelurulaxuteje.pdfIn PDF document text
- https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a210bba435a---fedeleviruf.pdfIn PDF document text
- http://rayer.cn/d/files/1955558898.pdfIn PDF document text
- https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160edde752dee3---vifami.pdfIn PDF document text
- http://surmounttravel.com/userfiles/files/xavopivuxopobus.pdfIn PDF document text
- https://mavachhaiphong.com/upload/files/zoxigigagokomalu.pdfIn PDF document text
- http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b7f43e1d80fcd2ba2d30c35181565710/58790185822.pdfIn PDF document text
- https://namratalakhotia.com/userfiles/files/26782416050.pdfIn PDF document text
- http://lblussana.it/images/file/84245515510.pdfIn PDF document text
- https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/194imc4mdubd4u83m9cqdlrto5/68870149655.pdfIn PDF document text
- https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/974ren0gt1t52tl7a6j5mamto2/44764224336.pdfIn PDF document text
- https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cbb6470f4---11726132711.pdfIn PDF document text
- https://amitadevnani.com/userfiles/file/lutorogida.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=john+deere+z225+drive+belt+diagramPDF 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000cee1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xCEE1	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off0000e6f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6F8	11040 bytes
SHA-256: `1a12844fc54d263a66c029dfeb1fc9fdde05976258a0b041e8d2e595b320bdd5`
`font_02_sfnt_off0001005f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1005F	16624 bytes
SHA-256: `e3481c63c3e51d46375f9761fedc1503c3bea390ec1eb9fbca6b3d01ff11a0b4`

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