Malicious PDF — malware analysis report

Static analysis result for SHA-256 999e4dbbc963cac3…

MALICIOUS

PDF

75.7 KB Created: 2021-09-08 00:49:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8d96756a96343fe8e9f0e9d02c8c9b8b SHA-1: 158dac7faa4ef2c34c175a9b6cbfec33e72ed60d SHA-256: 999e4dbbc963cac3dbef2469c095eb7f0b2be217bce604bbad642e313127a48e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal a link farm strategy, with multiple links pointing to PDFs hosted on compromised CMS uploads and disposable domains, suggesting an attempt to distribute further malware. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

Heuristics 7

  • 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.
  • 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 http://yuemeism.com/uploadfiles/files/91675200120.pdf In PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a33a49ee05b---pomevokupu.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/wewekilexutexitagud.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/93305194523.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1975e8d97257465540486bdfc1a75d52/tojisikazasefexuvoguluj.pdfIn PDF document text
    • http://topnotchimports.com/ckfinder/userfiles/files/6522767801.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ketadl0r1sb5bm675i7jo70ov9/gepadoziwakunofawutimoz.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ff110b6c456---likabukebirewoguwade.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/40999221612.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/59817805482.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202108162302529855.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862dea3af87---4527107882.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/16698145514.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/wudupodi.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b001e9bba69---61813461888.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/9e8f39afa52d3ab9e6e6c022e419f939/92515498770.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/43e82bd879952525259c45d210b596a1/ketoxaf.pdfIn PDF document text
    • http://shop-cartuning.pl/userfiles/file/42993028893.pdfIn PDF document text
    • http://greaterdeliveranceministries1.com/clients/61527/File/nomawudodedopofiwujugari.pdfIn PDF document text
    • http://imhkayseri.com/resimler/files/bidinujovoralivejipige.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/zodapuba.pdfIn PDF document text
    • http://waypl.pl/upload/File/balebulom.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/zusukosiwifizitevi.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/96725085345.pdfIn PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/24544792411.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/gixalenajuguwumamisapi.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/1712152253a0d4bafdb7c2ab45f31e9a/955420023.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=grep+linux+command+pdfPDF 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.

FilenameKindSourceSize
font_00_sfnt_off0000c636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC636 10756 bytes
SHA-256: 3fdeb8ca7cecec5555a7807e5017586d784be5534480fde93abf2bd6d19f426a
font_01_sfnt_off0000deda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDA 16256 bytes
SHA-256: 0980a01e7f383a7aa08e267ad2503814d380cc6159b2cd90058c5632f5ad6512
font_02_sfnt_off000108bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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