Malicious PDF — malware analysis report

Static analysis result for SHA-256 053e05802d35cf45…

MALICIOUS

PDF

81.8 KB Created: 2021-09-14 05:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: da0f439402db075524400974ca876bec SHA-1: e24a7138851e71a80e0a7feb2db81fe6911f1139 SHA-256: 053e05802d35cf4503dd21c8b21f0a79e91421f05485b4e269f0bf8a739eeb9c
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple links pointing to compromised WordPress sites, indicating a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613662935cb14---bawuxafedigegajebixifoz.pdf
    • http://usaoxin.com/userfiles/2021-9/file/vadebipofut.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c753ca42---28353102759.pdf
    • http://amoy-art.com/Upload/file/34788598431.pdf
    • http://whipitleather.com/userfiles/file/vekup.pdf
    • http://remobudostol.pl/pliki/konokojizusekus.pdf
    • http://neodentpetrosino.it/userfiles/files/kaviz.pdf
    • http://toyotarent.kr/FileData/ckfinder/files/20210901_793022286B1705ED.pdf
    • http://velisend.ru/photos/file/43918550652.pdf
    • http://cungcapbaoduongcuanhatban.com/upload/files/xozojubewutagotevowikexa.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613af3d39681d---70523046442.pdf
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuwafadegugovov.pdf
    • https://dentalrud.com/userfiles/file/kilinixijizidagobupuzo.pdf
    • http://autosoftware.company/autoresponders_images/files/sizexonu.pdf
    • https://villamishkan.com/310renonew/front/images/files/kizokakowizal.pdf
    • https://stealthwindow.tw/uploads/files/202109111901096058.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/998a46354778b6f42d90cb3111d84728/juzitoveru.pdf
    • http://hiroi-es.info/yamituki-n/uploads/files/lojukakikavevoxorip.pdf
    • http://sangsangins.com/upload/upload/file/10909600252.pdf
    • http://www.julietlandau.com/fckeditor/userfiles/file/budebov.pdf
    • http://studiomedicoveterinariobellucci.eu/userfiles/files/dawiferigobutajaxidi.pdf
    • http://xecuoihuyhoang.com/uploads/userfiles/file/gotofunime.pdf
    • https://lighthousemacau.com/html_upload/file/jorixo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=my+play+home+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dddd.bin
7b021cc95a499a8e4e38df2e4d01a1fbe08e37aff485b626223391eee3cedced		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDD 17300 bytes
font_01_sfnt_off00010a7e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7E 16792 bytes
font_02_sfnt_off00012295.bin
06f82aa7b889c356998c313d32dc03bf53662581105565fc22405520c14bf9c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12295 10496 bytes

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