PDF malware analysis — malicious · 4dc58b8f9f4d77fe

MALICIOUS

PDF

112.7 KB Created: 2021-06-27 23:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14

MD5: 9033546fe2e40c8a7bcdfcf0a439d26e SHA-1: 6fd0066e3dd159327ecad539858da66d16acad83 SHA-256: 4dc58b8f9f4d77fe36e7fb4f811f93f778ea9cc66f6ea482f7329196d4b7ff2c

96 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress installations or disposable hosting. The ML classifier strongly indicated maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall pattern of hosting malicious links within a PDF is a common phishing and malware distribution technique.

Machine Learning

Nyx PDF Classifier malicious score 0.9886

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://irlanc.ru/uplcv?utm_term=example+of+adequate PDF link annotation
- https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/791d6dc11fe736c5a46f38cc802cde1e/83506453037.pdfIn PDF document text
- https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/j4t2bgnuhsv8qb5lgo55t12eh4/72792448400.pdfIn PDF document text
- http://princeworldwide.com/multimedia/userfiles/file/10427093964.pdfIn PDF document text
- https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/fd368abe37988fa976ab05f619eb565d/kamikuxusatitumeboje.pdfIn PDF document text
- http://nbpcpentecostalchurch.com/clients/65183/File/75863373719.pdfIn PDF document text
- http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/275fd4b682b39b172333f32f7e1db8f8/83277553826.pdfIn PDF document text
- http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160715c6e52a5e---28739031223.pdfIn PDF document text
- https://greenfuturevietnam.com/Upload/files/96609897807.pdfIn PDF document text
- https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/a6ef4496df1f9f1261664035c4d94d51/wuxazatenaj.pdfIn PDF document text
- http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/e80632582d1a17685ee25b85095fdc12/99753488954.pdfIn PDF document text
- https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/3kri2t35b71ktrqv9lam7pvcvs/83259060586.pdfIn PDF document text
- https://eternalbliss.net/file/vixibubifiwapesujika.pdfIn PDF document text
- https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/c9b4540bccf194eebe618b8028397485/71605002825.pdfIn PDF document text
- https://gemwares.com/userfiles/file/rakefuvomofomolexorugolo.pdfIn PDF document text
- http://marasintl.com/public/ckfinderuploads/files/tadeguditudolar.pdfIn PDF document text
- https://pcstaiwan.com/ckfinder/userfiles/files/vimexudatesubogituxis.pdfIn PDF document text
- https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/b9b14074bd66663ab9b9fcb4a1102b7c/bemagij.pdfIn PDF document text
- http://innotack.com/userfiles/files/gisuzafixexaxisudu.pdfIn PDF document text
- https://vate-tire.ru/wp-content/plugins/super-forms/uploads/php/files/0b8adf585543b0d8a3152d2c70c84475/75033805149.pdfIn PDF document text
- https://stpeterscbs.ca/ckfinder/userfiles/files/82585567672.pdfIn PDF document text
- https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/71549237c257e55c95cfa4e0db9685a2/nujidatudozamawojusopewe.pdfIn PDF document text
- http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160983f0dacac9---verezodi.pdfIn PDF document text
- http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/su4apti49iig7tmn04saq2ft61/69467043570.pdfIn PDF document text
- https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ecd0fe025b65d4db864cf6e1cf26fe2d/88378626068.pdfIn PDF document text
- http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/d38c6408db1992fe44a5ee17e94d7ffd/biwivibokosulugaduxonipa.pdfIn PDF document text
- https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/2aad766f17bb7915c1a65821e1a7ab9e/48027447454.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_off000155b7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x155B7	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_01_sfnt_off00016dce.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x16DCE	10524 bytes
SHA-256: `353cfad48357dbfe3ef4c20a5001c5469e86a9f677275fd36e59bbc891f23f74`
`font_02_sfnt_off0001858f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1858F	18396 bytes
SHA-256: `294638031408e011e1dd63ee5d035ff089a0f01eba643f2c9aed50b87568a63e`

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