PDF malware analysis — malicious · 27f74d9880e98ee6

MALICIOUS

PDF

72.8 KB Created: 2021-09-13 00:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11

MD5: 0eba4e97067c9c1f604c6b9a69fc0a51 SHA-1: 3a3f73413d6ea9fe1da74b8eea6414188a90f938 SHA-256: 27f74d9880e98ee638c31ad801aee42e9ea568f62da4b3e49e93291e208f3508

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9940

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://synerhu.ru/uplcv?utm_term=informant+for+android PDF link annotation
- https://empresa-venta.hr/files/davusonupejasul.pdfIn PDF document text
- http://showpalmedical.com/userfiles/gamujolewinuramesotiv.pdfIn PDF document text
- http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nonitesofasepo.pdfIn PDF document text
- https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/zoretijujikojura.pdfIn PDF document text
- http://quatanggiabao.com/images/uploads/files/wazevajokolonusobex.pdfIn PDF document text
- http://feuerwehrobrigheim.de/upload/files/28602756956.pdfIn PDF document text
- https://rarahil.org.np/ckfinder/userfiles/files/tifivojuziwej.pdfIn PDF document text
- https://processwork.archerhuang.com/ConImg/files/29216915140.pdfIn PDF document text
- http://pizzeriadevita.it/userfiles/files/75362277095.pdfIn PDF document text
- http://moonlightmontessori.com/upload/files/60077900727.pdfIn PDF document text
- http://chingyi.tw/userfiles/files/78768574482.pdfIn PDF document text
- https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/7e8c6927548e63e293454757572c9be9/dajepafiguvisofizusezibab.pdfIn PDF document text
- http://lotusburbank.com/uploads/files/veliba.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dbb05ef17d40f2d60e07b99705ce5ea2/wurobesas.pdfIn PDF document text
- http://chapraptti.org/userfiles/file/15153844616.pdfIn PDF document text
- http://www.kroonzuivel.nl/ckfinder/userfiles/files/88339192752.pdfIn PDF document text
- https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613450953b1a5---losivotejilofinubox.pdfIn PDF document text
- http://buzmakov-ua.ru/admin/ckfinder/userfiles/files/fezivuguje.pdfIn PDF document text
- https://www.tristar-technology.com/ckfinder/userfiles/files/zesurinebofotevonagodi.pdfIn PDF document text
- https://gamma-electronics-eg.com/userfiles/files/91534873881.pdfIn PDF document text
- http://ekorob.pl/userfiles/file/bakidosexifezenu.pdfIn PDF document text
- http://progfin.pl/userfiles/file/taruxerowonifofon.pdfIn PDF document text
- http://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/mijisedavored.pdfIn PDF document text
- https://gencatakan.com/upload/file/wineso.pdfIn PDF document text
- http://terhautz.com/upload_files/files/36282359981.pdfIn PDF document text
- http://peter-scherer.de/userfiles/file/21329534447.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_off0000bdbd.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBDBD	16032 bytes
SHA-256: `dfb23853d114f1f432984d25e92af20e720a29d6e16c37bd21f53bddd19a2cb6`
`font_01_sfnt_off0000e6cf.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE6CF	10120 bytes
SHA-256: `9ef6689d076ebf2a5370003b68799c3a6e8c7961bad0a1bcad413237e001db81`
`font_02_sfnt_off0000fd53.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD53	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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